The customer made a reservation for two days and returned it for one day.

In this case, the responding customer should express gratitude, emphasize the policy and provide alternatives.

1. Thank you: First of all, thank the customers for their concern and reservation, and express their gratitude and respect for their choices.

2. Emphasize the policy: clearly inform customers of the hotel reservation policy, that is, cancellation is not allowed, so that customers can better understand the hotel regulations and agreements and avoid misunderstanding.

3. Provide alternatives: If customers really need to cancel one of the days, they can consider providing alternatives, such as recommending other tourist attractions or hotel rooms or activities to help them arrange their trips.