Formal Letter Generator

Write a formal letter in the given format to the recipient mentioned in the prompt. The letter should include the sender's address, date, recipient's address, subject, salutation, body, complimentary closing, and signature. The body of the letter should be divided into three paragraphs. In the first paragraph, introduce yourself and the purpose of writing the letter. In the second paragraph, provide details of the matter. In the third paragraph, conclude by mentioning what you expect from the recipient. Use formal language and a polite tone throughout the letter.