Helen, I want to have a word with you.
Is it about the appointment yesterday evening? Forget it. It doesn't really matter.
But I must say sorry to you. I didn't mean to break my word. I was about to leave home when my mother suddenly passed out. I took her to the hospital and looked after her all night. It was not until this morning that I remembered my date with you.
Oh, I'm sorry to hear that. Is she OK now?
She's alright, but I'm terribly sorry to have kept you waiting last night.
I quite understand it's not your fault, but don't forget to call me up next time if you can't come.