Pick the perfect wording and convey the message best suited for your situation. A response to a resignation letter has to be wellframed and polite, but you also need to be able to convey your disappointment at seeing the employee go.Want to know how to write a retirement letter of resignation? Get the insights you need and free retirement letter template to help guide the way. Add contact details, company name, and date. No, you don't ever say anything in a resignation letter other than "I resign, effect on this date". You want to give at least a two weeks' notice.