Apology Letter For Being Absent Without Notice

To,

[Client Name]

Dear [Name],

I am extremely apologetic for not informing you about my recent absence. I was in the face of an emergency and could not attend on [Mention date or the number of days]. It happened so suddenly that I did not have enough time to inform you.

I sincerely apologize for this mistake. I promise to never repeat this and make sure to inform before any future absences. I hope my apology can be accepted and I can continue to work harder.

I will be grateful if you could forgive me for this time. I look forward to your kindness regarding this matter.

Sincerely,

[Your Name]