answer: Alison tells #Person1# she doesn't want more food as she's on a diet.
documents: #Person1#: Alison, would you like to have some more? 
  #Person2#: No thanks. I have had enough. 
  #Person1#: Actually you haven't have much. 
  #Person2#: To tell you the truth, I am on the diet. 
  #Person1#: That sounds ridiculous. Why? 
  #Person2#: Well, I am gaining weight these days, and I have to watch my calories.