Subject: Apology for Missing the Deadline — Request for Extension Dear [Recipient's Name], I hope this letter finds you well. Firstly, I would like to express my sincere apologies for missing the deadline on [Project/Task Name]. I understand the inconvenience this may have caused and take full responsibility for my oversight. I assure you that this delay was not intentional and deeply regret any inconvenience it may have caused to you or your team. Despite my best efforts to complete the task on time, unforeseen circumstances and unforeseen difficulties intervened, resulting in the delay. Having realized the gravity of the situation, I would like to request an extension of [time frame] to adequately complete the project. Given the importance of this task, I want to ensure that I deliver the highest quality work and meet all the necessary requirements as expected. To rectify this situation, I am committed to working diligently and efficiently, putting in extra hours if needed, to accomplish the task at hand within the new proposed deadline. I will provide regular status updates to keep you informed of the progress and make certain that the revised completion date is met without any further delay. I understand the significance of adhering to deadlines and the effect it has on the overall project timeline and the trust you have placed in me. My aim is to regain your confidence by demonstrating my dedication and commitment towards completing this task in a timely manner. Again, please accept my sincere apologies for the oversight and any inconvenience caused. You're understanding and willingness to grant me an extension would be greatly appreciated. Should you require any further information or have any concerns, please feel free to contact me directly. Thank you for your understanding, and I assure you that this situation will not be repeated in the future. I look forward to your positive response. Yours sincerely, [Your Name] [Your Position/Designation] [Your Contact Information]