Suppose,you are Rahim.You are going to Cox's Bazar for a few days.You need to book a single room.Write an email to the manager of a hotel for booking a room.

Dear sir/Madam
I would like to book a single room at your hotel for three nights from next 10 to 12 October. Could I possibly  have a room with a balcony and attached bath? Please let me know if you need an advance payment for booking.

I look forward to hearing from you.