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 remember you said that you like China because it has cheap beers .  
 Person2:Yes , unbelievably cheap . Carlsborg is less than $ 1 .  
 Person1:        Why do you drink ? I mean , where does drinking get you ?  
 Person2:It's fashionable .  
 Person1:        Come on , you don't even know that blinds following is a sign of immaturity .  
 Person2:Mary , it's not about the blind following . What matter is I enjoy in drinking . It's like when you get off of work . You're so tired . You need to get relaxed . You can't just turn on the TV and keep watch the programs until you fall asleep . You need to make your after work time more fun .  
 Person1:        How ? By drinking ?  
 Person2:Drinking is just part of it . I mean , you have a bunch of friends coming by and having fun . You drink and talk . And the more you drink , the more you talk . It makes me so relaxed .  
 Person1:        When did you begin to drink ?  
 Person2:It's a long time ago . When I first went to a bar to pick up girls there , I saw the most beautiful girl sitting and sipping a coke . Then I went up to her and said ' can I buy you a drink ? '  
 Person1:        And then ?  
 Person2:Then I talked to her and got her number . You know what ? When you don't know what to say ? Just drink .  
 Person1:        So you get drunk every day ? 

informal