Here are seven tips to consider when writing a chef resignation letter: 1. Start with a friendly but official and professional introduction.Talk to the new company's HR and tell them that your previous company will issue you the experience certificate in 45 days time. Can anybody give me format of Resignation letter and Experince certificate? You can write a request letter asking for an experience certificate from the company. One of the most important part of quitting is to write a good resignation letter as Line Cook. Clearly state the required details, such as your name, job position, and the specific information needed in the certificate. : Write a formal letter or email to your employer requesting an experience certificate. Your request should be polite and professional. I would like to request that you please issue me an experience certificate so that I can begin the process of joining another company.