answer: Laura Woodhouse finds out physics is canceled but she never received the mail. #Person2# finds her mailing address is her old apartment. Laura thinks she should have changed it in time.
documents: #Person1#: Excuse me, could you tell me where physics 403 is? Has it been moved?
  #Person2#: OK. Let me check on the computer. Err I'm sorry, but it says here that the class was cancelled. You should have got a notice letter about this.
  #Person1#: What? I never got it.
  #Person2#: Are you sure? It says on the computer that the letter was sent out to the students a week ago.
  #Person1#: Really? I should have got it by now. I wonder if I threw it away with all the junk mail by mistake.
  #Person2#: Well, it does happen. Err let me check something. What's your name?
  #Person1#: Woodhouse Laura Woodhouse.
  #Person2#: OK, Woodhouse. Let me see. Ah, it says here we sent it to your apartment on the Center Street.
  #Person1#: Oh, that's my old apartment. I moved out of there a little while ago.
  #Person2#: Well, I suppose you haven't changed your mailing address at the administration office.
  #Person1#: Yeah, I should have changed it in time.