I hope this letter finds you well. I am writing to apologize for my recent unplanned vacation. I understand that this was an inconvenience to you and I am truly sorry for any disruption it may have caused.
I understand that I should have given you more notice about my vacation, but unfortunately, it was a spur of the moment decision. I had the opportunity to take a much-needed break and I took it without considering the consequences. I realize now that this was a mistake and I apologize for any inconvenience it may have caused.
I am aware that I should have been more considerate and given you more notice, but I was overwhelmed with the thought of taking a break and I acted without thinking. I understand that this was not the right thing to do and I am truly sorry.
I want you to know that I take my job seriously and I would never intentionally do anything to jeopardize my position. I understand that this was not the right thing to do and I am willing to do whatever it takes to make it up to you.
Once again, I apologize for my unplanned vacation and I hope that you can forgive me. I promise to be more considerate in the future and to always give you the proper notice before taking any time off.