Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input: Person1: You are too picky .
Person2:No , I'm not.Hey , look at that guy over there .
Person1: Which guy ?
Person2:The guy in the blue shirt at the table by the window .
Person1: I can't see him . Where ?
Person2:Right there .
Person1: Oh , I see him now . Wait ! That's ...
Person2:Yes , it's Mel Gibson .
Person1: Oh , wow ! It's really him ! Who is that woman he's with ?
Person2:I don't know . Why don't you go ask for his autograph ?
Person1: I can't do that .
Person2:Why not ?
Output:
informal