Dear [Recipient's Name], I am writing this letter to sincerely apologize for missing our scheduled appointment on [date] at [time]. I deeply regret not being able to attend the meeting as I understand the inconvenience this may have caused you and any negative impact it might have had on our professional relationship. Please accept my sincerest apologies for any confusion or frustration this may have caused, as it was never my intention to miss the appointment. Unfortunately, due to unforeseen circumstances, I was unexpectedly called out of town on an urgent matter that required my immediate attention. I understand that my absence was unprofessional and unacceptable, and I take full responsibility for this oversight. I value your time and understand the importance of keeping commitments. Furthermore, I assure you that such a situation will not occur again in the future. To avoid any such occurrences, I have taken measures to prevent schedule conflicts and have implemented a better system of organizing and prioritizing my responsibilities. I understand that your time is valuable, and I would greatly appreciate the opportunity to reschedule our meeting at your earliest convenience. I am eager to make amends and discuss any necessary next steps to rectify the situation, as well as any concerns or questions you may have. Once again, I extend my sincerest apologies for missing our appointment. I genuinely appreciate your understanding and forgiveness in this matter. I look forward to the opportunity to make it up to you and demonstrate my commitment to our professional relationship. Thank you for your understanding and consideration. I anticipate your positive response and the opportunity to make amends. Sincerely, [Your Name] [Your Contact Information]