answer: #Person1# apologizes to Helen for missing the appointment yesterday evening because #Person1# had to look after #Person1#'s mother who suddenly passed out. Helen understands it.
documents: #Person1#: Helen, I want to have a word with you.
  #Person2#: Is it about the appointment yesterday evening? Forget it. It doesn't really matter.
  #Person1#: 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.
  #Person2#: Oh, I'm sorry to hear that. Is she OK now?
  #Person1#: She's alright, but I'm terribly sorry to have kept you waiting last night.
  #Person2#: I quite understand it's not your fault, but don't forget to call me up next time if you can't come.