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 are you listening to ? Is that Beethoven or Mozart ?  
 Person2:it's Beethoven . Do you like it ?  
 Person1:        I think Beethoven's music is incredible . I've heard that listening to it can make you more intelligent , too . Do you believe that ?  
 Person2:I don't know about that , but I do think that it helps people relax .  
 Person1:        what other kind of music do you listen to ?  
 Person2:actually , I mostly just listen classical music . What about you ?  
 Person1:        to be honest , I think classical music is too complicated for me .  
 Person2:what kind of music do you prefer then ?  
 Person1:        I like pop music . Do you ?  
 Person2:not really . I don't think pop music has much depth .  
 Person1:        I see what you mean . I think that's way I like it so much .  
 Person2:how long have you been in to pop music , then ?  
 Person1:        I've always been into it . Have you always liked classical music ?  
 Person2:not really . When I was little , we didn't really listen to music at all .  
 Person1:        so , how did you become interested in it ?  
 Person2:well , when I was about 10 years old , I started playing the piano . I think that's how it all started .  
 Person1:        do you still play piano ?  
 Person2:yes , it's one of my hobbies . 

formal