Subject: Apology for Missing the Deadline — Request for Extension Dear [Recipient's Name], I hope this letter finds you well. I am writing to sincerely apologize for the missed deadline regarding [project/task] that was due on [date]. I understand the inconvenience and frustration this may have caused you and assure you that I take full responsibility for this oversight. Firstly, I would like to explain the circumstances that caused this unfortunate delay. [Provide a brief explanation of the situation, such as unexpected personal/family emergency, technical difficulties, or any other valid reason that affected your ability to complete the task on time]. Please be assured that I have been working diligently to complete the [project/task] within the agreed-upon timeframe, and I deeply regret that unforeseen obstacles hindered my progress. I understand the importance of adhering to deadlines and the impact it has on overall productivity and workflow. To rectify the situation, I would like to request an extension of [number of days/weeks] to finalize the [project/task] up to the standard that both you and I expect. I assure you that I am fully committed to completing the work within the new proposed deadline and will make every effort to ensure that this situation does not happen again in the future. I fully understand the value of the commitment placed on punctuality and dependability in our professional relationship. Rest assured, I will take necessary steps to prevent such delays in the future. I assure you that my future performance will not be affected by this incident. Once again, I offer my sincerest apologies for the inconvenience caused due to my failure to meet the original deadline. I appreciate your understanding and willingness to grant me an extension. If you require any additional information or have any concerns, please do not hesitate to contact me. Thank you for your professionalism and understanding in this matter. I look forward to working together to successfully complete the [project/task] within the extended deadline. Yours sincerely, [Your Name] [Your Contact Information]