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:       I just saw Something About Mary last night . It was hilarious . 
 Person2:David took me to it last week . I thought it was a little sick . 
 Person1:        What do you mean sick ? It was really funny , don't you think ? 
 Person2:It was entertaining in some ways . But in general I didn't like it . 
 Person1:        Why not ? 
 Person2:I just think the humor was too gross . There were too many disgusting things in it . I don't think a comedy has to have so much smut to be funny . 
 Person1:        It wasn't a dirty movie . There wasn't even any nudity . 
 Person2:No , you're right . But nudity doesn't bother me . What bothered me were all the jokes about masturbation , stuff like that . It was too sick . 
 Person1:        Oh , you are too conservative . It's just realistic . 
 Person2:I don't think it's realistic . I thought it was sick . Why does a movie have to use that kind of humor ? 
 Person1:        People think it's funny . 

informal