Write an introductory paragraph. In the first paragraph of any letter of request, introduce yourself, and clearly but briefly state the purpose of the letter.1. In the sample letter, fill in your personal information. List your name, account information, the original creditor of the debt, and the debt collection agencies identifying information. Need help with writing a letter requesting financial assistance? Check out our sample letter and templates to get started. This e-book provides templates for 21 most effective credit and collection letters that will help you communicate better with your customer. 1. In the sample letter, fill in your personal information. Credit Line Request. But creditors may be willing to negotiate with you even after they write your debt off as a loss.