When a customer asks for a size or color that is out of stock, "sold out" does not have to be the end of the sales conversation. But the business should not promise a restock date it cannot verify. A better process explains what is available now, offers a genuinely suitable alternative when one exists, and records an optional restock follow-up with clear customer permission.

Separate availability, alternatives, and future supply

"Do you have this item?" is a question about current inventory. "Is there another option?" asks for a different product. "When will it return?" is a question about a future delivery that may still be uncertain. Combining all three into one generic chatbot reply creates avoidable errors.

Start with the exact product identifier, size, color, or specification. Check the approved inventory source. If that source is not current, say the team needs to verify availability rather than confidently announcing stock that may already be sold.

What should the reply actually say?

For a clothing retailer, an appropriate draft might be: "That size is currently unavailable according to our latest update. We can show you an alternative model and explain the differences. If you prefer to wait for this exact item, we can record your request for a restock update." This is a hypothetical example, not a Mr. AI customer story or a promise of a built-in inventory feature.

If an alternative differs in size, material, specification, or price, state that difference before presenting it as a substitute. A customer asking for a particular size may not want another one simply because it is available.

Treat the waitlist as a distinct customer request

When the customer opts to wait, record the exact item variant, contact channel, consent for the specific update, request date, status, and person responsible for checking. Do not treat "tell me when this comes back" as blanket consent for promotional campaigns.

The WhatsApp Business Messaging Policy, updated September 23, 2026, requires appropriate permission for subsequent contact and respect for opt-out requests. Messages initiated outside the customer service window also need to follow approved template requirements. Review the consent and opt-out workflow before sending restock notifications.

When inventory returns, do not blast the entire list

First verify that the item is physically or operationally available for sale and that the quantity is confirmed. Match the exact variant to waiting requests, then exclude customers who withdrew permission or no longer need the update.

A notification that an item is back in stock is not the same as a reservation. Do not promise a held unit unless the business has an actual reservation policy and process. For scarce inventory, the team should approve a clear and fair allocation rule rather than letting an AI assistant decide who gets the final unit.

Measure useful outcomes, not notification volume

Each week, track valid waitlist requests, verified updates sent to permitted recipients, opt-outs, and actual orders resulting from those requests. Keep "notification sent" separate from "customer purchased." Even when sales follow an update, do not attribute the entire result to automation without evidence.

An Egyptian electronics retailer can begin manually: collect requests for a particular color, review the list when a shipment arrives, verify the quantity, and contact only customers with suitable permission. This process can be useful before investing in any automated inventory integration.

What Mr. AI can and cannot do here

The current Mr. AI FAQ confirms company-knowledge replies, follow-up support, conversation summaries, and human intervention. We do not claim native live-inventory synchronization, automatic stock reservations, or a turnkey restock notification integration. First test how the assistant handles uncertainty and product questions, then evaluate Mr. AI with your team.

If the customer has already placed an order, the separate order status update guide covers post-purchase communication.

Sources: WhatsApp Business Messaging Policy, September 23, 2026, WhatsApp Business Platform features.