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:       I think modern painting means nothing .  
 Person2:I think so too . It's just pointless .  
 Person1:        Then why are so many guys so crazy about it ?  
 Person2:I don't know . Maybe they're really crazy .  
 Person1:        Maybe . 

formal