answer: #Person1# went to interview Roth and is thirsty. #Person2#'ll buy #Person1# a drink.
documents: #Person1#: I went to Roth's to interview her, you know, Edith Roth is the author of a book about moths.
  #Person2#: Is she? I thought she was a mathematician.
  #Person1#: I'm so thirsty.
  #Person2#: Are you? I thought you had something to drink at her home.
  #Person1#: No. Edith didn't give anything to drink.
  #Person2#: I'll buy you a drink.
  #Person1#: Oh! Thank you.