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:       Who is the next one ?  
 Person2:It's Peter's turn .  
 Person1:        Give the mike to him .  
 Person2:OK .  
 Person1:        Be quiet . He is singing .  
 Person2:I thought he only liked to listen !  
 Person1:        So did I .  
 Person2:He has a really good voice !  
 Person1:        Yes , he sings wonderfully . 

informal