Twelve WhatsApp templates for waitlists and availability: we are full, join the list, a slot opened, and it has gone

"Sorry, we are full" ends a conversation. "We are full, but I can put you first in line for a cancellation" keeps it. These twelve templates run a waitlist by hand or by agent, from the polite full reply to the message that says the slot has gone.

By Ritchie, ReplyKit · Published 5 September 2026 · 4 min read

Quick answer

Twelve templates: the full reply with alternatives, the waitlist offer, the preference questions, the confirmation of a waitlist place, the slot-opened offer with a reply deadline, the confirmation to the first YES, the it-has-gone message to the others, the next-available reply, an availability update for a popular day, a seasonal capacity notice, a waitlist expiry check, and a removal confirmation.

Before you use these When you are full When a slot opens Availability updates FAQ

Before you use these

All templates are written for replies to people who messaged you first, or for customers who gave you their number for this purpose. Do not send them as outbound campaigns; that breaks WhatsApp's Business Messaging Policy. Edit the bracketed parts, keep the tone yours, and shorten anything that feels long on a phone.

When you are full

Full with alternatives

We are full at [time] on [date]. I can offer [day] at [time] or [day] at [time]. Would either work?

Waitlist offer

If you would prefer [original day], I can add you to the waitlist and message you the moment a slot opens. Shall I?

Preferences

Added. To match you quickly: which days and times suit, and how much notice do you need (same day is fine, or at least a day)?

Waitlist confirmation

You are on the waitlist for [service] on [preferences]. If a slot opens, I will message you with a short reply window. You can also keep your [alternative] booking meanwhile.

When a slot opens

Slot opened

A slot has opened: [service] on [day, date] at [time] with [staff]. Reply YES within 20 minutes to take it; it goes to the first confirmed reply.

Confirmed

It is yours. Booked: [service], [day, date] at [time]. See you then. Reply CHANGE if plans shift.

It has gone

Sorry, that slot has just been taken. You are still on the waitlist and I will message you about the next one.

Next available

The next available [service] is [day, date] at [time]. Shall I book it, or keep you on the waitlist for something sooner?

Availability updates

Popular day

Heads-up for anyone asking about [date]: we are now fully booked. Nearest availability is [date]. The waitlist is open.

Seasonal notice

[Season / holiday] bookings are open. Slots on [peak dates] usually go within days, so book early; a deposit of RM [amount] holds them.

Waitlist expiry check

Hi [name], you have been on our waitlist for [service] since [date]. Still looking for a slot? Reply YES to stay on it, or I will remove you to keep the list fair.

Removed

Noted, I have taken you off the waitlist. Message any time to rebook.

Every template here can be a taught answer or an instruction line in a ReplyKit agent, so the waitlist is offered when full, preferences are recorded, and the slot-opened loop runs automatically after a cancellation without a person copying and pasting. The agent asks the questions in order, fills the lead card, and hands over when the template says a person should. Instructions are in how to write instructions.

The process is in running a waitlist on WhatsApp.

Frequently asked questions

What should I say when I am fully booked?

Offer two alternatives and the waitlist in the same message.

How long should the reply window be for an opened slot?

About 20 minutes for same-day slots, longer for later dates.

Who gets the slot if several people reply?

The first confirmed YES. Say so in the offer.

How long should someone stay on a waitlist?

About a month, then ask if they want to stay.

Can an AI agent run the waitlist?

Yes, from the offer through the slot-opened loop.

Full, but never a dead end

Waitlists run automatically by the agent. 7-day free trial.

Start free

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. These are the messages ReplyKit's booking agents use to run a waitlist automatically; the deadline and first-confirmed rule are what keep it fair. 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

WhatsApp Business Messaging Policy · opt-in, opt-out and prohibited-use rules every business must follow
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

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.