Cancle the 1 room booking mail
Here's an example email to cancel a one-room booking:
Subject: Cancellation of Room Booking
Dear [Hotel/Hostel Name],
I am writing to inform you that I would like to cancel my booking for [Room Type] at your hotel/hostel, which was scheduled for [Check-in Date] to [Check-out Date].
I apologize for any inconvenience this may cause and appreciate your understanding in this matter.
Thank you for your time and assistance.
Sincerely, [Your Name]