answer: Monica is guessing #Person1#'s big news which is #Person1# lost weight.
documents: #Person1#: Hi, Monica, I got big news.
  #Person2#: You got a raise?
  #Person1#: Not really, just take a wild guess.
  #Person2#: You got promoted?
  #Person1#: Well, it is not going to happen so soon, I guess.
  #Person2#: You won a lottery? Don't beat around the bush, just tell me, please.
  #Person1#: Ok, I lost 5 pounds.