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:       Oh my God ! I can't find my first period American literature class .  
 Person2:You look lost . Can I help you ?  
 Person1:        Aren't you the guy who sat in front of me in our homeroom ?  
 Person2:Yeah . I'm Brad .  
 Person1:        I'm Mary . I can't find my American literature class .  
 Person2:What room is it ?  
 Person1:        It's 112 .  
 Person2:It's on the first floor by the nurse's office .  
 Person1:        Thanks a lot , Brad . I've got to go before the bell rings . 

formal