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:       And lots of Dear Abby sob stories ...  
 Person2:Hey ! I learn a lot from the psychologists who give advice in those columns !  
 Person1:        No wonder you're such a wacko ...  
 Person2:Whatever ... Smell ! Perfume samples !  
 Person1:        Nice . Hey , I like the layout of this page ...  
 Person2:You mean , you like the pictures of the beautiful models ... Hello ? 

formal