How To Write A Formal Letter To A Hotel . Hotel sales letters are used for informing the clients about the latest offers and discounts being provided by the hotel. Also enquire about activities and places of interest near the hotel. Hotel complaint letter from www.bizzlibrary.com Dear guests, i would like to extend to you a very warm welcome. Start by addressing the letter to the right person. Dear [hotel manager name] , my family and i had the misfortune of staying at your hotel from [check in date] to [check out date] in room number [804].