How to write a formal apology letter? Explaining a catering problem

I want to know how I can write
A formal letter of apology from airline
To a costumer
Explaining a catering problem
And a baggage problem. Happened on arrival at the airport
And the rude behavior of an C.A

Can any body help.

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,

First, you need to do drafts for these and post them here. Then we can provide our feedbacks as to how you can improve.
Please accept this letter as our formal apology for whatthe incident that took place athappened on {location, event, issue, etc...} on {MM/DD/YYYY}. While this is by no means an excuse for {my behavior, what happened, etc...}justifying the unfortunate scene, we feel knowing the cause will help us guard against future mistakes.

hi! every one i need help please give me sample a letter about room reservation.

thank you.