How do you write a letter of explanation to immigration for missing an appointment?

To write a letter of explanation to Immigration for missing an appointment, start by clearly stating your name, case number, and the date of the missed appointment. Briefly explain the reason for your absence, ensuring it is honest and straightforward. Apologize for any inconvenience caused and express your willingness to reschedule or provide any necessary documentation. End the letter with your contact information and a respectful closing.