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 , what's up ?  
 Person2:Oh , nothing .  
 Person1:        What were you writing ?  
 Person2:( Laugh ) All right . You caught me in the act . I finally worked up the nerve to ask Diana out . I was just writing a note to put on her desk .  
 Person1:        You mean you're going to ask her out in a note ? You big chicken !  
 Person2:I admit it . I'm a wuss . I just can't do it in person .  
 Person1:        But , you work with her everyday .  
 Person2:That's different . When I'm working , I'm in a different frame of mind . But , when I even think about asking her out , I get tongue-tied . At least in a note , I can get the words out without turning beet red .  
 Person1:        You've dated a lot . What's so different about Diana ?  
 Person2:Well , for one thing , she's gorgeous . She's so upbeat and sweet . Who doesn't like her ? Oh , I don't know . All I do know is that I think we have great chemistry together . But , what if I'm wrong . Maybe she's just been nice to me out of courtesy and doesn't think of me that way . Oh ... forget it . This was a bad idea .  
 Person1:        Well , I guess you don't want this note , then .  
 Person2:What note ?  
 Person1:        I was looking for you to deliver this note from Diana . She wants to know if you want to go to the office party with her tomorrow night .  
 Person2:You're kidding ! I can't believe you've been standing this entire time and didn't say anything .  
 Person1:        Sorry . What can I say ? Now , do you want the note or what ?  
 Person2:Yeah , I want the note .  
 Person1:        Have a great time tomorrow night .  
 Person2:Thanks . I plan on it . 

informal