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:       Have you ever sung with a karaoke ?  
 Person2:Yes , I do it quite often .  
 Person1:        Karaoke has become a major entertainment . I wonder why .  
 Person2:Simple , it's fun .  
 Person1:        How much fun is there in singing in front of other people , especially if you don't sing well ?  
 Person2:Ah , that's the biggest fun of all . You see , even though you're not a good singer , people will listen to you .  
 Person1:        I wouldn't do that .  
 Person2:But I like the feeling . 

formal