Enquiries in languages you do not speak: how an AI agent replies in the customer's language from your own knowledge, where it is reliable, where to hand over, and how to take over a chat you cannot read

Tourism, exports, expatriate communities, online sales: sooner or later a message arrives in a language nobody on the team reads. Until recently the options were a translation app and a slow, awkward reply. Now the agent answers in the customer's language from your English knowledge, and the remaining question is what you do when it hands over.

By Ritchie, ReplyKit · Published 5 October 2026 · 6 min read

Quick answer

An AI agent reads the customer's message in any major language, finds the answer in your English knowledge base, and replies in the customer's language, so most enquiries are handled without anyone on your side reading that language. Keep your knowledge in one language, add a line in the instructions to mirror the customer's language, and test with messages in the languages you expect. When a chat is handed over, use your phone's or WhatsApp's built-in translation to read it, reply in English or your language with a note that you are using translation, or keep a translated quick-reply set for the common hand-over situations. ReplyKit does the language work on every plan.

How the agent does it Setting it up When it hands over and you cannot read the chat Honest limits FAQ

How the agent does it

The model underneath reads and writes dozens of languages. Your knowledge stays in English (or your language); the agent understands the question in Spanish or Thai or Arabic, retrieves the relevant lines, and writes the reply in the customer's language. Mixed-language and informal messages work too. The one caveat is retrieval: a question in another language is matched against English knowledge, and the match is weaker for rare terms, so the agent may say it is not sure more often; the details and the languages that work best are in what languages the agent speaks, and the knowledge-writing tips in knowledge for a multilingual agent.

Setting it up

Add one line to the instructions: "Reply in the language the customer writes in. If you cannot tell, reply in {your language}."
Add key terms in the languages you expect for things that do not translate well: your service names, place names, product names.
Set the formality per language if it matters ("Use formal address in German and Japanese").
Test with ten messages in the three languages you see most, including a slang one, and check the answers against your knowledge.

When it hands over and you cannot read the chat

Read it. WhatsApp and most phones translate a message with one tap; the inbox shows the whole conversation, so paste it into a translator if needed.
Reply honestly. "I'm writing with the help of translation; sorry for any awkward wording." Customers are forgiving when told.
Translated quick replies. Prepare the five hand-over messages (we will call you, here is a quote, we cannot do this, please send a photo, thank you) in your top three languages once, and keep them as quick replies.
Hand back. Once the human part is done, return the chat to the agent, which resumes in the customer's language.

Honest limits

Humour, idiom and very informal dialect occasionally misfire. Formality defaults may be wrong for cultures with strong distinctions unless you set them. Rare languages and scripts retrieve less reliably. And a complaint in a language you do not speak still needs a human who can be understood, which is where the translated quick replies and an honest note carry you. For a business where one language dominates, a staff member who speaks it is still worth having; the agent makes the other twenty languages affordable. Reply tone across languages is set as in persona and tone.

Frequently asked questions

Can the agent reply in a language I do not speak?

Yes. It reads the message, answers from your English knowledge, and replies in the customer's language.

Do I need to translate my knowledge base?

No. Keep it in one language; add key terms in other languages only where names do not translate well.

What happens when the agent hands over a chat in another language?

Translate it with your phone or WhatsApp's built-in tool, reply with a note that you are using translation, or use prepared translated quick replies.

Which languages work well?

All major languages. Rare languages and heavy dialect are less reliable, and formality may need setting.

Does this cost extra?

No. Language handling is included on every plan.

Every language answered, from one knowledge base

The agent replies in the customer's language; you take over with translation when needed. 7-day free trial, no card.

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Written by Ritchie, ReplyKitPart of the small team in Malaysia that builds and runs ReplyKit. Writes about WhatsApp automation, AI customer service and small business lead response.

How we know this. ReplyKit agents reply in the customer's language by default, and this guide reflects what customers serving tourists, expatriates and overseas buyers learned about where that works and where a person is still needed. Product figures in this article (limits, prices, per-reply costs) are taken from ReplyKit as it runs today and are re-checked when we update the page. Where we cite outside research, the source is linked below. We sell ReplyKit, so read our product claims with that in mind; we say where a different tool or no tool is the better choice. About ReplyKit.

Sources and further reading

Harvard Business Review, The Short Life of Online Sales Leads (Oldroyd, McElheran, Elkington, 2011) · firms that responded within an hour were about seven times more likely to qualify the lead
WhatsApp Business Messaging Policy · opt-in, opt-out and prohibited-use rules every business must follow

ReplyKit is an independent product and is not affiliated with or endorsed by Meta or WhatsApp. This article is general guidance for running a small business, not legal, financial or regulatory advice.