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's your favorite hobby ?  
 Person2:I'd like reading books best .  
 Person1:        What kinds of books do you like to read ?  
 Person2:Literature and economy .  
 Person1:        By the way , would you like to see movies ?  
 Person2:That's OK .  
 Person1:        What do you do in your spare time ?  
 Person2:I like to play golf , play badminton or crack jokes .  
 Person1:        I just like to sleep like a lazy cat .  
 Person2:That's a bad habit . 

formal