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:       What do you need ? 
 Person2:I need to use the Internet . 
 Person1:        You have your library card , right ? 
 Person2:Yes , I do . 
 Person1:        There is a wait right now to use the computers . 
 Person2:That ’ s fine . 
 Person1:        Would you please write your name on this list ? 
 Person2:Then what ? 
 Person1:        I will call you when a computer is free . 
 Person2:How do I log on to the computer ? 
 Person1:        Use the number on the back of your library card . 
 Person2:Thanks . I ’ ll be sitting over there . 

formal