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:       Do you like jazz , Tom ?  
 Person2:No , I don't like it very much . Do you ?  
 Person1:        Well , yes , I do . I'm a real fan of Wanton Marsalis .  
 Person2:Oh , does he play the piano ?  
 Person1:        No , he doesn't ! ! ! He plays the trumpet . So , what kind of music do you like ?  
 Person2:I like rock a lot .  
 Person1:        Who's your favorite group ?  
 Person2:The Cranberries . I love their music . How about you ? Do you like them ?  
 Person1:        No , I don't . I can't stand them ! ! 

formal