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:       Guess what came in the mail today ?  
 Person2:What ?  
 Person1:        My acceptance letter to Yale !  
 Person2:Wow ! Congratulation ! When do classes start ?  
 Person1:        Freshman orientation is the last week of august , but I want to go two weeks before that to get settled in .  
 Person2:You ’ re so lucky ! Do you have to do many things before you leave ?  
 Person1:        Yes . I ’ ll be very busy ! I have to get a visa , buy a plane ticket , and pack my things . But first , I want to register for classes .  
 Person2:When can you do that ?  
 Person1:        Well , they sent me their prospectus , so I can start looking now . do you want to help me decide which classed to take ?  
 Person2:Sure . What can you choose from ?  
 Person1:        Well , I have to take all the fundamental course , plus a few from my major .  
 Person2:What is your major ?  
 Person1:        I hope to major in English literature , but the admissions counselor told me that many people change their major many times in their first year , so we ’ ll see .  
 Person2:What are the fundamental course ?  
 Person1:        In order to graduate , every student must take a certain amount of classes in history , math , English , philosophy , science and art .  
 Person2:Interesting . That ’ s very different from the Chinese education system .  
 Person1:        Yes , it is . It ’ s also very different from the British education system .  
 Person2:Really ?  
 Person1:        oh , sure . In British , students don ’ t have to take the foundation course .  
 Person2:why not ?  
 Person1:        maybe because they think they know everything already ! ha ha . 

informal