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:       Hey John , did you register for classes yet ?  
 Person2:I register this Friday .  
 Person1:        What classes do you plan on taking ?  
 Person2:I really want to take the communication class , but I don't know if it will be available .  
 Person1:        Is that class really that popular ?  
 Person2:Yeah . I tried to get in last semester , but it was full by the time I registered .  
 Person1:        What other classes are you going to take ?  
 Person2:I still need to take English 201 , but I really don't like writing .  
 Person1:        I took that class already . There is a lot of writing , but it's not that bad .  
 Person2:Oh really ? Who was the instructor ? There are like 4 different instructors to choose from .  
 Person1:        I had Professor Mahoney .  
 Person2:Is he an easy grader ?  
 Person1:        I'm not sure if he is or not , but I thought he was definitely fair .  
 Person2:Do you mind if I ask you what you got ?  
 Person1:        Not at all . I got a 3.8 .  
 Person2:Well , what did you get in English 101 last year ?  
 Person1:        I got a 4.0 in that class .  
 Person2:Well , I can't compare to you . I got a 3.1 in English 101 . That means if you got a lower grade in English 201 , it must be harder .  
 Person1:        It's not what it appears . I actually tried harder in the 101 class . If I put as much effort into the 201 class , I would have received the same grade .  
 Person2:Oh . That helps . Thanks . 

informal