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:       Hi , Jenny . Are you going to school now ?  
 Person2:Yup . I have English at 9 in the morning .  
 Person1:        Got any plans after the class ?  
 Person2:Not really . What about you ?  
 Person1:        We will have our midterm exams next month . I plan to look for some important books and study at the library . Do you want to join me ?  
 Person2:Sure . I need to return some books . They are due today . Besides , I can also read some weekly publications , magazines and newspapers .  
 Person1:        Great . We can go to the swimming pool in the gymnasium after that .  
 Person2:That sounds like a good idea . We can chill out a little in such a hot summer . Are you good at swimming ?  
 Person1:        Well , that's a good question . I haven't swum for almost two years . I think I need more practice .  
 Person2:Oh , it's almost 9 . I need to hurry . I am running late now . See you after class in front of the library then . Bye !  
 Person1:        See you then . 

informal