To write a short notice resignation letter, include your position and effective date, explain your reason and express gratitude. Learn how to write a resignational letter if you're quitting for personal reasons.Offer Advanced Notice; 4. It is not necessary to officially provide a reason for leaving or resigning. Please accept this message as my formal notice of resignation. I am fortunate to have received a long awaited opportunity that I cannot pass up. This resignation letter sample provides your employer with a letter for your file and also suggests that you've done everything you can to remain professional. How to Use Two Weeks Notice Letter? This is usually stated clearly at the beginning of the letter along with your intention to leave and the reason why. Employer's. Telephone No. NOTICE TO EMPLOYER.