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:       You did well on the math test .  
 Person2:Of course .  
 Person1:        Don ’ t you always fail in the math tests ?  
 Person2:Things were different this time . I sat by a math genius .  
 Person1:        Huh ? You mean you snuck a peek at his test ?  
 Person2:B :: Come on ! I just took a glance .  
 Person1:        Are you crazy ? You were cheating . 

informal