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:       The answer is zero ! What a let-down !  
 Person2:I really want to take him over my knee .  
 Person1:        No hard feelings . After all , he is a child .  
 Person2:If you say so ! 

informal