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:       I don't have my homework today .  
 Person2:You usually are good about turning it in ; what happened ?  
 Person1:        I was really sick .  
 Person2:But couldn't you have done it when you felt better ?  
 Person1:        Yes , I probably could .  
 Person2:You have already missed one other assignment ; when can I expect the make-ups ?  
 Person1:        Next class meeting .  
 Person2:That will be soon enough , but make sure you get next week's assignment in as well , all right ?  
 Person1:        That would work for me .  
 Person2:Good . I know that you are capable of being an excellent student . 

informal