Statements explaining the reasons for a resignation must not be considered to be contingencies unless expressly stated as contingencies. Give them a standard two-week notice.Should you include a reason for leaving? Due to the nature of my work I was taken off the schedule immediately and they made my official termination date the date I gave notice. The purpose of a resignation letter is to document for the company that you intend to leave, when, and optionally why. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience. Add contact details, company name, and date.