Dear Sam,
I am writing this letter to apologize and explain about the recent missed deadline for an important financial project. I had started working on the project as soon as we got the instructions from the team and was updating the progess in the progress report. However, two days before submission date, I got a viral infection and was admitted to a hospital for almost a week. I brought my laptop to the hospital to complete the remaining work but the doctors suggested me complete bed rest. So, due to unforeseen circumstances, the project was left unfinished. I assure you this will never happen in the future. I would finish things a week before so that if there is delay due to any other reason, the project will already be finished. As you already know that I had submitted my work on time in the past and I am hoping you will forgive me this time.
Yours sincerely,
Dave.
