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 would you say if I told you I was going to quit school ? 
 Person2:I ’ d say , think twice about it . Well , you are not going to quit school , are you ? 
 Person1:        I don't know . I failed my exam . 
 Person2:What did you get ? 
 Person1:        A B plus . 
 Person2:That's not bad . 
 Person1:        But I should have aced it . I mean I finished the paper so quickly , thinking it's a piece of cake . But when I knew my result , I was like what ? That can't be true ! 
 Person2:Listen , John . I understand that you are such an excellent student and I know you must have lots of stress , but you really want to give up ? 
 Person1:        No , I don't . I just don't know how to handle this . This is my first time , you know . 
 Person2:I know . Don't worry . Do you know what you should do ? 
 Person1:        What ? 
 Person2:You need to blow off some steam . The world is not on your shoulder . 
 Person1:        How ? 
 Person2:Forget about school and exams . Come over to my house and have fun . I have some really good DVDs . 
 Person1:        Thanks . But I really don't feel like watching movies tonight . I have to get an early start in the morning . 
 Person2:Then go to bed and have a good sleep . 
 Person1:        I guess that's what I need . Thanks . You're being a really good friend . 
 Person2:Of course I am . Well , pleasant dreams ! 
 Person1:        Thanks , bye . 

informal