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 unsure how to add a class and need help . 
 Person2:I have an opening . Do you have an add sheet for me to sign ? 
 Person1:        Yes , I have an add sheet . 
 Person2:After I sign it , you must take it to the Admissions and Records Office to add the class . Do you know where that is ? 
 Person1:        No , I'm not sure . 
 Person2:When you cross the quad , the office is right in front of you . Go inside and follow the signs to the correct line . 
 Person1:        Thanks . I understand what to do now . 
 Person2:It should be easy to find . After you add the class , check with me in a few weeks to make sure that you are on my roll sheet . 
 Person1:        That sounds good . 
 Person2:Good , just make sure that you do the same thing if you ever need to drop a class . Good luck ! 

informal