Dear [Recipient's Name], I am writing this letter to sincerely apologize for missing our scheduled appointment on [date] at [time] in [location]. I understand that my absence may have caused inconvenience and frustration, and I deeply regret any inconvenience caused. The reason for my failure to attend the appointment was [state the reason]. I truly understand the importance of honoring commitments, and I am aware that my irresponsibility has disrupted your schedule and caused you inconvenience. Please accept my heartfelt apologies for any inconvenience and disappointment caused. I assure you that this was an isolated incident and not a reflection of my usual professionalism and commitment. I value our professional relationship and your time, and I am committed to rectifying this situation and ensuring that it does not happen again in the future. To make it up to you, I would like to propose an alternative date and time for our meeting. I am available [suggest alternative dates and times]. I hope one of these options works for you. However, if none of these options are suitable, please let me know your preferred date and time, and I will do my best to accommodate your schedule. Once again, I extend my sincerest apologies for any inconvenience I caused. I am committed to ensuring that this mistake does not happen again, and I look forward to rescheduling our appointment at your earliest convenience. Thank you for your understanding and patience. I greatly appreciate your willingness to give me another opportunity to meet with you. Please feel free to reach out to me at [contact details] for any further discussion or clarification. Yours sincerely, [Your Name] [Your Title/Organization] [Contact Details]