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 see the woman ? Is she a teacher ?  
 Person2:Yes , she is .  
 Person1:        Does she teach Chinese ?  
 Person2:No , she is an English teacher .  
 Person1:        And who ’ s the man in the green beside her ?  
 Person2:You mean the man wearing jeans ? He ’ s her little brother . 

formal