Dear Mr. Smith,
I hope this message finds you well. I am writing to sincerely apologize for not submitting my course assignment on time. I understand that my delay may have caused inconvenience, and I truly regret any disruption this may have caused.
Unfortunately, I encountered some health issues recently, as I was suffering from the flu until just a few days ago. I felt quite unwell and was unable to focus on my coursework, which ultimately prevented me from completing the assignment by the deadline. My doctor advised me to rest at home for three weeks, making it challenging to manage my studies during that time.
Given these circumstances, I kindly request an extension of one week to finalize my assignment. I am now feeling much better and am confident that I can complete the work within that timeframe. Ideally, I would appreciate a little more time to ensure that I can also catch up on lessons, but I understand if that is not feasible.
Once again, I apologize for my inability to submit the assignment on time, and I appreciate your understanding regarding my situation. Thank you for considering my request, and I look forward to your response.
Yours faithfully,
Zara Alexsandra