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 have any hobbies ? What is it or what are they ?  
 Person2:I am interested in watching TV or other relaxing games .  
 Person1:        How do you spend your spare time ?  
 Person2:I usually read or entertain myself .  
 Person1:        What kind of books are you interested in ?  
 Person2:My favorite books are those about detectives .  
 Person1:        Well , those books are really good . I like them too . How do you entertain yourself ?  
 Person2:When it comes to the entertainment , I think I enjoy dancing . There is nothing I like more than modern dance . 

formal