I hope this message finds you well. I am writing to inform you that, due to an unforeseen family emergency, I was unable to attend the scheduled exam on [date of the missed exam].
I deeply regret any inconvenience my absence may have caused and sincerely apologize for not being able to notify you in advance. The situation required my immediate attention, and I was unable to make alternative arrangements to attend the exam.
Given the circumstances, I kindly request your understanding and consideration in granting me an opportunity to sit for the exam on another day. I am fully prepared to take the exam at your earliest convenience and am committed to fulfilling my academic responsibilities.
Please let me know if any additional documentation or information is required to support my request. I am more than willing to comply with any procedures necessary to facilitate this process.
Thank you very much for your time and understanding. I look forward to your favorable response.