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:       Do you like the Harry potter books and movies ? 
 Person2:Not really ! 
 Person1:        Why not ? They are very fun and exiting . 
 Person2:Maybe , but I think they are just for kids . 
 Person1:        No , that ’ s not true . Many adults like the Harry potter books too . 
 Person2:Maybe they don ’ t agree with my taste . 

formal