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:       Alright , we need to have a plan here . First of all , which bed do you want ?  
 Person2:Well , everybody wants the bottom bunk . Why don't we flip a coin for it ?  
 Person1:        Alright . Do you have a coin ?  
 Person2:Yes . Here's a quarter . I flip it , you call it in the air .  
 Person1:        Heads .  
 Person2:Sorry , it's tails . You lose .  
 Person1:        Oh , well . So you get the bottom bunk . What about our stereos ? It looks like we both brought our stereos . Probably we only have room for one .  
 Person2:Your stereo is better than mine . Do you mind if we use yours ?  
 Person1:        No , I don't mind . I just don't know where we can put the speakers in this tiny room .  
 Person2:Probably we can put one on that counter . And we can put one on the floor by the bed . Over there .  
 Person1:        Alright . That's a good plan . What about the desks ? We have two desks , one by the window and one by the door ? Which one do you want ?  
 Person2:Well , the desk by the window is nicer , of course . Don't you think ?  
 Person1:        Yes , I agree .  
 Person2:So since I got the bottom bunk , why don't you get the desk by the window ? That would be more fair .  
 Person1:        Alright .  
 Person2:I mean , we could flip a coin for it , but I would probably win again . I'm incredibly lucky you know . Especially with girls .  
 Person1:        Is that right ?  
 Person2:Yes , that's right .  
 Person1:        Well , I hope you let me hang out with you then . Maybe I can learn from you .  
 Person2:Oh , certainly . Certainly . I'm always willing to help beginners.Just call me Big Brother Dave .  
 Person1:        Are all lucky people so stuck up ?  
 Person2:C'mon , don't take it seriously ! I'm just kidding .  
 Person1:        Anyway , I get the desk by the window , you get the bottom bunk . That's it .  
 Person2:Why don't we start unpacking these boxes ?  
 Person1:        I will go get something to eat . You unpack first.Then , when I come back , I'll unpack .  
 Person2:Alright . See you later . 

informal