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 , I ’ d like to apply for a library card . 
 Person2:Certainly.Here ’ s an application form.Do you have proof of residence ? 
 Person1:        What sort of proof do you need ? 
 Person2:A driver ’ s license or something showing that you live in this city . 
 Person1:        I ’ m a student from out of state , so I don ’ t have a local driver ’ s license . 
 Person2:Do you have a current electricity or gas bill in your name ? 
 Person1:        The phone bill ’ s in my name . 
 Person2:That ’ ll do.Bring the most recent one in with your completed application , and we ’ ll issue you a temporary library card right away . 
 Person1:        How long will it take to get the regular one ? 
 Person2:It ’ ll be mailed to you within two weeks , but you can borrow books on the temporary card . 
 Person1:        Okay.Thanks for your help . 

informal