Dear Mr./Miss/Mrs（自己根据情况用）XX,
I am YY of department A. When Mr. C and D trip to India on 30th of this month, your department help to order their hotel. Flight of Mr. C will arrive India on 23th night, so he will check in hotel one day earlier than Mr. D. Please help us infrom the hotel. Thanks.
Mr. C and Mr. D flight information is as follows: . . . . . .
请自行确认文中日期,原文中描述有所冲突.