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:       Professor , can you help me add your class ?  
 Person2:You have to bring me an add sheet to sign . Do you have one ?  
 Person1:        No , I will have to get an add sheet .  
 Person2:You must take the signed add slip to the Admissions and Records Office to add the class . Do you know where that is ?  
 Person1:        No , I don't know where that is .  
 Person2:The office is in front of you as you cross the quad . The signs in the hallway will tell you where you need to be .  
 Person1:        I think I can find it .  
 Person2:You'll find it easily . Make sure you add the class and then we will look at the roll sheet later to make sure that you were added on .  
 Person1:        Thank you for letting me add your class .  
 Person2:To drop a class , you need to do the same thing with a drop slip . Good luck ! 

formal