How To Write A Cancelation Letter In Writing . End the letter by thanking the concerned authorities for considering your cancellation request. You can write the date either at the right or left top of the letter, below the printed header. Letter for Cancelation College Admission from www.bizzlibrary.com Mention that you wish to receive confirmation. There are different types of cancellation documents you can compose such as an insurance cancellation letter, gym. When you get ready to cancel a contract, write a contract cancellation letter.