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 am not sure how to add a class .  
 Person2:Do you have an add sheet for me to sign ?  
 Person1:        I'll bring one next time .  
 Person2:When you get the signed add slip , you must take it to the Admissions and Records Office or you will not be added . Can you find the office ?  
 Person1:        I think I know where it is .  
 Person2:Across the courtyard on the right is the office . Follow the signs to the correct line . Is that clear ?  
 Person1:        Thank you for your directions . It's clear .  
 Person2:You can't miss it . Add the class and then come back . We'll check later to make sure you are on the roll sheet .  
 Person1:        That's great . Thank you so much .  
 Person2:Do the same thing with a drop slip if you ever need to drop a class . Good luck ! 

informal