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:       Hello . Can I help you ?  
 Person2:Yes , I hope so . I would like to register for Comp Lit 287 .  
 Person1:        I'm sorry , but that class is already full.And also , students are supposed to register through the touch-tone registration system .  
 Person2:I know . I already tried to register for it by phone , but the computer won't let me .  
 Person1:        That's because it's full .  
 Person2:But I'm a new student here . I thought maybe there was some way I could get into the class . I thought I should come and talk to you in the department office .  
 Person1:        Well , I could put you on a waiting list.But that doesn't guarantee you will get into the class . What is your name ?  
 Person2:My name is Karen Huang . That's spelled H - U - A - N - G .  
 Person1:        Alright . And what is your major ?  
 Person2:I'm a comparative literature major .  
 Person1:        Wait a minute . You're a Comp Lit major ?  
 Person2:Yes , that's right .  
 Person1:        Why didn't you tell me ? I didn't know you were one of our students .  
 Person2:That's why I'm trying to get into Comp Lit 287 . I know it's a required class.And Professor Cohen told me I need to take it .  
 Person1:        The university computer system saves extra places , in class 287 for comp lit students . I can give you a special code.When you register by phone , you can use the code to get into the class .  
 Person2:Even if the class is full ?  
 Person1:        That's right .  
 Person2:Oh , I didn't know that .  
 Person1:        Sure . Here is the code number , with information on how to use it .  
 Person2:Thank you . So you think I will be able to get in with this ?  
 Person1:        Sure . Just call the touch-tone registration system again.Then , follow the directions on the sheet . You will get in no problem .  
 Person2:Thanks .  
 Person1:        Next time you come in here , I will recognize you . 

informal