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:       Donna , you really shocked everyone at the party last night !  
 Person2:You mean with my performance ?  
 Person1:        Yes ! We have all assumed that you were the quiet , shy type .  
 Person2:I guess everyone has a few secrets up their sleeve .  
 Person1:        Where did you learn to sing like that ?  
 Person2:I was part of a band in school .  
 Person1:        You ? Wow . And why don't you ever dress like that at work ?  
 Person2:Come on ! This is work . Don't you think that would be a little weird ? 

informal