Dear [Recipient's Name], I am writing to sincerely apologize for missing our scheduled appointment on [date] at [time]. I understand that my absence may have inconvenienced you, and I deeply regret any frustration or inconvenience caused. Due to unforeseen circumstances, I was unable to attend the appointment as planned. I take full responsibility for the oversight and understand that it is unprofessional and disrespectful to not show up without prior notice. Please know that this was not intentional, and I genuinely value our professional relationship. I understand the importance of being punctual and reliable, and I assure you that it will not happen again in the future. I am actively taking steps to ensure that I manage my schedule effectively to prevent any recurrence of such situations. Additionally, I am implementing a reminder system to keep me on track and ensure no appointments are missed moving forward. I understand if you are disappointed or frustrated with my absence, and I genuinely appreciate your understanding and patience in this matter. If you are willing to reschedule our appointment, I would be more than willing to accommodate your availability at your earliest convenience. Please let me know what works best for you, and I will make the necessary arrangements promptly. Once again, I apologize for any inconvenience or disappointment caused. I value our professional relationship and assure you that this incident does not reflect my commitment to our work together. Thank you for your understanding, and I look forward to the opportunity to make it up to you. Sincerely, [Your Name] [Your Contact Information]