How To Write A Letter Concerning Quote . Describe the requirements of goods or services you need. This rule isn’t just for speech. Request Letter For Quote Quotation Letter Sample / Format / Example from www.lareverde.org The letter is often written by the service or product supplier to a potential client, a business, or a person, because of a request or inquiry that was made. Explain that you received a lot of quotations and you’re going to select the one that fits your terms. Never ask for 5/10/15 % and so on.