answer: #Person1# calls Mr. Smith's office to ask about her son's performance, but Mr. Smith is unavailable. #Person2# tells #Person1# about his available time.
documents: #Person1#: Hello. Is this Mr. Smith's office and the Chemistry Department?
  #Person2#: Yes, it is. Can I help you?
  #Person1#: Yes, I am the mother of a student in his class. I want to talk with Mr. Smith about my son's performance. Is Mr. Smith in?
  #Person2#: No, he's having class at the moment.
  #Person1#: Do you know when I can reach him?
  #Person2#: He has office hours between 1:00 and 3:00 this afternoon. You can reach him after office hours.
  #Person1#: That's fine. Thank you very much.