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 , Shirley ! Want to join me for lunch ... my treat !  
 Person2:Wow ! Sure !  
 Person1:        I must confess I have an ulterior motive for asking you to lunch .  
 Person2:Oh ... that's OK ... as long as you're buying !  
 Person1:        I really want to pick your brain about something I've been thinking a lot about .  
 Person2:I'd love to help if I can .  
 Person1:        Well , as you know , I have a Bachelor's degree in English literature and that's served me well so far , but I've always wanted to do some post-graduate work ... maybe even get a Doctorate !  
 Person2:Wow ! Just the idea of going back to school fills my head with pain .  
 Person1:        But you have a Master's degree ... hasn't that helped your career ?  
 Person2:Yeah , I'd have to say it has . But I'm still paying for it , you know .  
 Person1:        I know education is expensive , but it's been my lifelong dream . Call me crazy , but I've always wanted to have that PhD at the end of my name .  
 Person2:Well , getting a Doctorate degree would mean close to a decade of school . Can you afford that ? Can you survive that ?  
 Person1:        I certainly can't afford it , but I'm sure I could find some good student loans .  
 Person2:I think you need to separate the dream of having a PhD from the reality of years of more schooling . It's not as romantic as you might think .  
 Person1:        Yeah ... I keep thinking about what I'll do with a Master's or Doctorate . I love language but I don't think there are a lot of well-paying jobs out there for experts on Shakespeare .  
 Person2:Uh huh , that's for sure . You might find that your only career choice is teaching other graduate students . 

formal