answer: #Person1# is asking #Person2# some detailed questions about #Person2#'s visit to the States. #Person2# plans to leave in mid-January, will call to ask #Person1# the answer.
documents: #Person1#: Why don't you sit down? Now, there are several questions I must ask, if you don't mind.
  #Person2#: Not at all. Go ahead.
  #Person1#: What is the purpose of your visit to the States?
  #Person2#: I'm going to attend a conference on air pollution.
  #Person1#: When and where is this conference being held?
  #Person2#: It's being held in the first three weeks of February at the University of Stanford in California.
  #Person1#: Who will pay your expenses?
  #Person2#: The University of California. Here is the official letter of invitation.
  #Person1#: I see. Fine. When do you want to go?
  #Person2#: I'd like to leave in mid-January if my passport is ready by then.
  #Person1#: That shouldn't be difficult. Why don't you phone me about January 10th? I should be able to give you an answer then.
  #Person2#: Thank you.