answer: #Person1# is a visiting scholar and is passing the customs under the guidance of #Person2#.
documents: #Person1#: Here's my passport. I'm a visiting scholar.
  #Person2#: Do you have anything to declare?
  #Person1#: No, these are all my personal effects.
  #Person2#: What's in the bag? Would you mind opening the bag?
  #Person1#: Not at all. I don't know what's dutiable. Do I have to pay duty on things for my own use?
  #Person2#: NO. You don't have to pay duty on personal belongings.
  #Person1#: Thank you.