The purpose of this letter is to convey my sincere apology for leaving early and fail to log out,
It so happened that day was when I saw there was only 10 minutes more of support time and no new work updates, I took it for granted and left earlier.
Let me assure you that I will instill in my mind, before I leave in this office to check & not to fail to log out.
Once again sorry for what has happened.
I would like to convey my sincere apology for leaving early and failing to log out on [date]. That day I saw there was only 10 minutes more of support time and no new work updates, so I took it for granted and left early.
Let me assure you that in future before I leave the office, I will always check and log out properly.
Once again, sorry for my mistake.
People are waiting to help.