怎样写英文抱歉信

I’m terribly sorry that....
We like to apologise for ....
例文：
Dear XXX

We like to apologise for what happened yesterday.
It was our biggest regret for things to go wrong yesterday and I like to apologise on the behalf of our xxx that we are deeply sorry about yesterday.
YOu wasn't particularly satisified with us yesterday and now, we like to apoplogise.

有些句型，可以套用，你可以参考一下：
i'm so sorry that...非常抱歉（后面可以写你做错什么，忘记什么...)
my mistake,i forget to...我弄错了，我做错了，我忘记...
i apologize for it.我为此道歉
please forgive me.请原谅我
i'm sorry for it again为此，再次道歉

iytii