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 often do exercise ?  
 Person2:Certainly .  
 Person1:        OK , and what kind of sports do you usually play ?  
 Person2:I often play badminton with my parents .  
 Person1:        You ? Play badminton ? That's unbelievable ! You are shorter than a racket .  
 Person2:Hey , I'm good at playing it .  
 Person1:        Says who ?  
 Person2:My parents .  
 Person1:        Oh , I see .  
 Person2:How about you , Daniel ?  
 Person1:        I'm a real man , and I like football .  
 Person2:Well , who is your favorite football player ?  
 Person1:        I like Renaldo the most . 

informal