answer: #Person2# is calling to complain that the screen of the camera always goes black. #Person1# asks #Person2# to go to the repair center so that #Person2# might have the camera replaced or get a refund.
documents: #Person1#: Hello, this is Canon Camera Company in Beijing. Good morning. What can I do for you?
  #Person2#: Well, I am making this phone call to complain about a digital camera made by your company.
  #Person1#: What is the problem with it?
  #Person2#: The screen always goes black.
  #Person1#: Could you tell me how long this has been happening?
  #Person2#: It started a week ago.
  #Person1#: Then is it still under guarantee?
  #Person2#: Yes, I bought it only a month ago.
  #Person1#: OK. Can you tell me where you bought it and the type of camera?
  #Person2#: I bought it in Xidan Shopping Market. Its model number is IXUS210.
  #Person1#: OK. You can bring it to our repair center to let the staff look at it first. If there is a problem with the camera, you can have it replaced or get a refund.
  #Person2#: Where is your repair center?
  #Person1#: It's at 1553 Palace Street on the seventh floor. We apologize for causing you trouble.