Apology Letter For Omission

Dear [Name],

I am writing to apologize for my omission. I understand that my mistake has caused you frustration and inconvenience, and I am truly sorry for that.

I let you down by not [describe the action you failed to do], and I take full responsibility for that. I should have been more attentive and responsible, and I regret not fulfilling my obligation.

I understand that my omission has caused you [describe the consequences], and I am deeply sorry for the trouble I have caused. I am truly sorry for not being able to meet your expectations and I will make sure that such a mistake never happens again.

I know that apologies cannot undo the damage caused, but I want to assure you that I will do my best to make it up to you. I am willing to do whatever it takes to make sure that you are satisfied with my work.

Once again, I apologize for my omission and I hope that you can find it in your heart to forgive me.

[Your Name]