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:       Can you do push-ups ?  
 Person2:Of course I can . It's a piece of cake ! Believe it or not , I can do 30 push-ups a minute .  
 Person1:        Really ? I think that's impossible !  
 Person2:You mean 30 push-ups ?  
 Person1:        Yeah !  
 Person2:It's easy . If you do exercise everyday , you can make it , too . 

informal