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:       Hey , you , pick up that piece of garbage ! 
 Person2:Huh ? Me ? 
 Person1:        Yeah , you . I just saw you throw a piece of garbage on the ground . Can't you read the No Littering sign ? It's a $ 500 penalty for littering , so go pick it up and put it in the garbage can over there . 
 Person2:Why should I do that ? It's only a piece of garbage . Why should you care ? 
 Person1:        Because this is a public place , and I want to spend my time here without having to look at your garbage . 
 Person2:Listen , I really don't know why you're making this into such a big issue . It's only a small piece of garbage in a large space . It's not like there's garbage everywhere . Besides , someone will come along to clean it up at some time or another . 
 Person1:        It's not the cleaner's responsibility to pick up after lazy people . It's part of your responsibility to make sure that the place is neat for other people . If everyone thought like you , there'd be garbage everywhere ! The cleaners can't be everywhere ! 
 Person2:Ok , whatever . See , I'm putting it in the garbage can . 
 Person1:        Hold on , that's an item . You should put that in the recycle bin next to the trashcan . 

informal