When you're teaching it you get to call it your Sorry John, you're absolutely right. OK.

你是对的,顺便请你们注意一下。

麻省理工公开课 - 计算机科学及编程导论课程节选

Remember you can say "I'm sorry" when you wish to express your regret, your sympathy or ambiguous regret.

记住，当你想表达歉意、同情或是含糊的道歉时，你都可以用“I'm sorry”。

I'm sorry 课堂 - SpeakingMax英语口语达人