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:       Do you know anything about Dr . Miller's classes ?  
 Person2:Yes . Are you in his class ?  
 Person1:        I'm thinking of taking his class next semester .  
 Person2:He really knew his stuff , but he graded hard . Would that be OK ?  
 Person1:        Yes , I really need someone who is really good .  
 Person2:I didn't find it overwhelming to earn a good grade if you work at it . Can you do that ?  
 Person1:        Maybe , but I'm not sure .  
 Person2:Man , this guy was so funny when he was teaching . I like that , don't you ?  
 Person1:        No , that stuff isn't important to me .  
 Person2:Did you know that he is a fairly new teacher and very current in his field ?  
 Person1:        I don't care about any of that .  
 Person2:We all are looking for different things in an instructor . I hope I've helped you . 

formal