Email the guest that regarding with the key that was lost during his trip because the host contacted us and he wants to get reimburse for the key that was lost.

Subject: Follow-Up on Lost Key Issue During Your Stay Dear [Guest's Name], I hope this message finds you well. I'm reaching out to discuss the matter of the key that was lost during your recent stay with us. The host has contacted us expressing their concerns regarding the lost key and has requested reimbursement for the replacement cost. We would like to reach a resolution for this issue promptly. Could you please provide any details related to the situation? If you have any information that might help us understand what happened, it would be greatly appreciated. Our goal is to ensure fair treatment for both our guests and hosts. Thank you for your cooperation. We look forward to hearing from you soon. Best regards, [Your Name] [Your Position] [Your Contact Information] [Your Company Name]