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:       What are you hiding in your coat pocket ? 
 Person2:It's a camera . 
 Person1:        You want to take pictures of the inside of your pocket ? 
 Person2:Not even funny , Billy . This is my new snapshot sticker camera . 
 Person1:        What's that supposed to mean ? 
 Person2:Well , there are adhesive strips on the backs . You can stick them anywhere . 

formal