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:       Hey , look ! They ’ re playing reruns of the 1996 Olympics .  
 Person2:Isn ’ t that Michael Johnson ? I think he set a world record in this race .  
 Person1:        He completed the first 200 / 400 double in Olympic history !  
 Person2:Are you sure ? What about Carl Lewis ? He won four golds , didn ’ t he ?  
 Person1:        Carl won the gold in the 100 , 200 , long jump , and 4x100 relay in 1984 .  
 Person2:I like the way Carl runs . He looks more graceful . 

formal