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 do you do in your spare time ? 
 Person2:I have many hobbies . I like almost all kinds of sports and I also like to listen to classical music . 
 Person1:        What kinds of sports do you like ? 
 Person2:I like playing basketball . Basketball is a very exciting game because it keeps you alert and I also enjoy the team spirit of basketball . 
 Person1:        Who is your favorite author ? 
 Person2:I like the novels of Dickens very much . I've read almost all of them in Chinese translation . 
 Person1:        Are you a music lover ? 
 Person2:Yes , I like listening to Beethoven's works . 
 Person1:        What kinds of films do you enjoy ? 
 Person2:I like all kinds as long as they are exciting . 

informal