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:       William , do you like studying English ?  
 Person2:I like studying English , and I can read well , but speaking can be difficult .  
 Person1:        It's not that bad . If you talk to your American friends every day , you'll learn quickly .  
 Person2:Can I ask you a question ?  
 Person1:        Sure , what do you want to know ?  
 Person2:I have my book from class here . How do you say this word ?  
 Person1:        Laptop .  
 Person2:Sorry , I don't understand . What does that mean ?  
 Person1:        A laptop is a type of computer that you can carry with you . Do you understand ?  
 Person2:Yes , I think so . Can you say it again ?  
 Person1:        Laptop .  
 Person2:Laptop . Did I pronounce that correctly ?  
 Person1:        Yes , that's right . That's very good .  
 Person2:Thanks . And this word ? How do you pronounce this ?  
 Person1:        That word is pronounced kitchen .  
 Person2:Thanks so much . You're a good teacher .  
 Person1:        Thanks . 

informal