How To Write A Formal Letter To An Attorney . When you write a letter to a law firm, your name and address should be at the top of the page, on the right hand side. Sample letter to attorney requesting file. My letter to Attorney General Jeff Sessions Chris Van Hollen Medium from medium.com If you don't have a case number, write out your name (or the name of the main client on the case) in. The names of the said people. Include the exact dates when the related people or companies interacted.