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 ? 

informal