answer: Dirk invites Andy to the performance of Justin Bieber for the weekend, but his aunt says Andy won't go because there's something wrong with Andy's stomach.
documents: #Person1#: Hello, auntie. Is Andy in? I want to invite him over for the weekend. The great young singer Justin Bieber is giving a performance in the concert hall nearby.
  #Person2#: Oh, thank you, Dirk. But I don't think Andy will be able to make it.
  #Person1#: Why? Doesn't he like Justin Bieber?
  #Person2#: He does like him. But there's something wrong with his stomach. He went to the doctors with your uncle for an examination today. He hasn't come back yet.
  #Person1#: I'm sorry to hear that. I hope it is nothing serious.
  #Person2#: I hope so, too. But he was in great pain this morning. I was really scared.
  #Person1#: What do you think caused it?
  #Person2#: I don't know for sure. Perhaps it has something to do with what he ate last night. He went to Mary's birthday party and ice cream was served there.
  #Person1#: He likes ice cream?
  #Person2#: You are right. He must have eaten too much.