answer: #Person2# is going to New York for three days.
documents: #Person1#: Where do you have to go. 
  #Person2#: To New York. 
  #Person1#: When do you have to be there. 
  #Person2#: Tomorrow morning. 
  #Person1#: How long do you have to be there? 
  #Person2#: Three days. 
  #Person1#: When will you be back? 
  #Person2#: On Friday.