answer: #Person2# asks #Person1# about the professors and government officials.
documents: #Person1#: They are professors and government officials. 
  #Person2#: Where are they from? 
  #Person1#: Most of them are from America and Europe. 
  #Person2#: What are they doing in Beijing? 
  #Person1#: They are attending an international conference here. 
  #Person2#: Which hotel are they staying at? 
  #Person1#: They are staying at the Hilton Hotel.