2. You can communicate with the guests and ask if it is possible for other family members to sign on their behalf, or for the previous waiter to sign on their behalf. If the guests can explain clearly, they can handle the bill with confidence.

3. If the guest can't explain clearly, or the guest has doubts, you can consider rechecking the bill and try to find out the reason why the signature of the bill doesn't match.

If you can't find the reason, you should take the initiative to apologize to the guests and propose solutions, such as re-issuing the correct bill or reducing some expenses to make up for the losses and dissatisfaction of the guests.

5. Such incidents should be recorded and analyzed to avoid the recurrence of similar incidents and further improve the management and service process in the store.