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:       Suit wrote me a letter .  
 Person2:What did she say ?  
 Person1:        She got a master degree , and now she is going for her doctor .  
 Person2:Really ? I can't believe it .  
 Person1:        It's not a surprise , is it ? She has always been a hard working student .  
 Person2:But I think a master degree is good enough for a girl . 

informal