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:       Catherine , have you ever seen the movie Fast Food Nation ?  
 Person2:Yes , I remember it was inspired by a New York Times best-seller of the same name .  
 Person1:        It's very thought-provoking , isn't it ?  
 Person2:Exactly . It reveals the dark side of the all-American meal .  
 Person1:        So what do you think of the American fast food culture ?  
 Person2:I think America really deserves the name of " fast food nation - as people can find McDonald ' s , KFC and Pizza Hut almost all over the States .  
 Person1:        And everyone knows that Americans ' favorite food is the hamburger , isn't it ?  
 Person2:Sure . You see , Tom , fast food is a lifestyle that craves convenience . People just don't care whether it is healthy or not .  
 Person1:        But I think some healthy menu options are also served at fast food restaurants ..  
 Person2:What are they ?  
 Person1:        Such as fat-free milk , whole-wheat rolls and fish sandwich .  
 Person2:They're much better  
 Person1:        But I'm not sure if they're well-rcceived .  
 Person2:That's the point . People usually don't have much time to think about it when they have a on-the-go meal .  
 Person1:        Well , Americans may need to find a way to make the most of their fast foods .  
 Person2:I suppose so . 

formal