Letters / How to write a formal apology letter? Explaining a catering problem [4]

Dear {Recipient}

Please accept this letter as our formal apology for what happened on {location, event, issue, etc...} on {MM/DD/YYYY}.

It was not intention of our company to cause any damage or inconvenience. In retrospect, we do believe the situation resulted from {cause}. While this is by no means an excuse for {my behavior, what happened, etc...}, knowing the cause will help us guard against future mistakes.

We are sorry for what happened. We look forward to hearing from you and putting this matter behind us.

Sincerely,