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'.

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