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:       Well , the way you drive , Jen ... I still don't think that's a good idea .  
 Person2:I really love this music . It's a compilation .  
 Person1:        I know . It's a mix of all the latest songs .  
 Person2:And you got them off the Net ?  
 Person1:        No . I recorded these from your Cds .  
 Person2:Well , thanks for asking for my permission ... Now hand it over and let me record !  
 Person1:        I knew I shouldn't have shown you my new toy ... 

formal