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:       Excuse me , Professor , I have a problem and need to leave class early .  
 Person2:Why do you have to leave early ?  
 Person1:        I am not feeling well .  
 Person2:Could you make it up by attending my other section this week ?  
 Person1:        Yes , it's all taken care of .  
 Person2:Are you leaving right away or can you stay for a few more minutes ?  
 Person1:        I can stay a few more minutes .  
 Person2:OK , but please make sure that you get all of your make-up work completed .  
 Person1:        Thanks , Professor . I've got it covered !  
 Person2:Go do what you have to do , but make sure it doesn't happen again . 

formal