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:       Where can I buy textbooks ?  
 Person2:First , you need to have the list of books for your class . Do you have that ?  
 Person1:        Yes , I have that .  
 Person2:Well , when you have that , you can take it over to the bookstore . Can you find it ?  
 Person1:        No , I don't know where the bookstore is .  
 Person2:Just pass the gym and it's the first door on your left . Were you aware that you can also turn in your old textbooks for money ?  
 Person1:        Really ? How can I do that ?  
 Person2:Take your used textbooks with you and give them to the representative near the entrance . He will pay you for them . Are you going today ?  
 Person1:        No , I can't make it today .  
 Person2:I could help you with buying your books if you meet me there at 1  
 Person1:        No , thanks . I'm good .  
 Person2:I'll see you later then . Have a great day ! 

informal