answer: #Person2# is teaching #Person1# to use #Person1#'s key card.
documents: #Person1#: Excuse me, do you speak English?
  #Person2#: Yes, do you need some help?
  #Person1#: Actually, yes. Could you show me how to use my key card?
  #Person2#: Yes, sure. You need to put your card in the slot.
  #Person1#: Ok, like this?
  #Person2#: That's right. Then wait for the green light and turn the handle.
  #Person1#: Oh, it's open. Thank you very much.