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:       so , how's your course going ? Do you like it ?  
 Person2:i like my professors and the classes , but it's a lot of work .  
 Person1:        what are you specializing in ?  
 Person2:right now , I'm doing some research into the languages of different African tribes .  
 Person1:        that sounds really interesting . Can you speak Swahili ?  
 Person2:yes , I learned how to speak it when I was little .  
 Person1:        really ? How did you do that ?  
 Person2:well , I grew up in Africa , so I learned quite a few different languages .  
 Person1:        that's amazing . Are you doing well in your classes ?  
 Person2:I don't know because I haven't received my test results yet .  
 Person1:        when did you take your exams ?  
 Person2:about two weeks ago .  
 Person1:        how do you think you did ?  
 Person2:I left feeling pretty confident about my score , but I heard that my professors are very strict graders , so I'm a bit nervous .  
 Person1:        I'm sure you'll do well . Did you study hard ?  
 Person2:You know me ; I'm always studying !  
 Person1:        don't worry . If you don't do well , no one can !  
 Person2:Thanks for the vote of confidence , Justin ! 

informal