Apology Letters for Not Completing Work

Dear {Recipient},

I'm sorry I failed to {file the records/enter the data/schedule the appointment/etc.} that you requested earlier. I didn't mean to be negligent, but {reason} prevented me from completing the task.

I'm not trying to come up with an excuse, though. Please let me know what I can do to sort this out. I'm willing to {stay back after office hours/reach out to the client/etc.}.

Sincerely,
{Your Name}

Dear {Recipient},

I'm sorry I didn't submit my homework on {topic} which was due on {date}.

The day before the deadline, {reason for not completing homework}. I was actually already halfway through my assignment; however, since {elaborate on reason}, I was unable to finish it on time.

I hope you can grant me an extension and still allow me to submit my homework. Thank you for your kind understanding.

Sincerely,
{Your Name}

Dear [Name],

I am writing to apologize for my inaction. I understand that I have failed to take the necessary action to address the situation, and I am deeply sorry for that.

I know that my inaction has caused you a great deal of frustration and disappointment, and I want to express my sincerest apologies for that. I understand that I have let you down and I take full responsibility for my actions. I should have been more proactive and taken the initiative to address the situation, but I failed to do so.

I want to assure you that this will not happen again. I have taken the time to reflect on my actions and I have identified the areas where I need to improve. I am committed to taking the necessary steps to ensure that this does not happen again.

I understand that my apology may not be enough to make up for my inaction, but I hope that it can be a start. I value our relationship and I want to make sure that I do not let you down again. I am committed to doing whatever it takes to make things right.

Once again, I apologize for my inaction and I am truly sorry for the inconvenience that it has caused you.

Sincerely,
[Your Name]