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:       May , is the university a terrible place ?  
 Person2:Surely not . Life in the university is fun . Why did you ask ?  
 Person1:        Because you study day in and day out for the entrance exam . So I figure you would study even harder after you ’ Ve got in .  
 Person2:Studying in the university is not easy , but it's not as arduous as you think .  
 Person1:        How do you know that ? You haven't got in yet .  
 Person2:Of course I know . I once attended Lisa's class , sitting quietly at the back of the classroom .  
 Person1:        Oh , really ? Were you not caught ?  
 Person2:Of course not . You are allowed to attend any lecture , only if there are empty seats for you and you don't disturb the class . In universities , you study in a free and creative environment .  
 Person1:        What do you want to study in the university ? Have you thought about it ?  
 Person2:This question has really been bothering me . I like Chinese literature , you know . But economics is really hot now , and it has a very good career prospect .  
 Person1:        I will choose what I like . You don't know what a torture it is for me to study English , because I don't like English .  
 Person2:Though I like Chinese literature very much , I'm also interested in economics . It's a tough choice to make .  
 Person1:        You can decide later . You will have choices before you submit your university application form .  
 Person2:Right . I have lots of time to think carefully before I make my final decision . 

informal