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: Consider Input: Person1: Can I still get tickets for tonight's performance ?
Person2:The balcony is still available .
Person1: Aren't there any other seats ?
Person2:No , I'm afraid that's it .

Output: formal

Input: Consider Input: Person1: What did he say ?
Person2:He said he would tell us the secret of becoming a successful man .
Person1: It ' s too good to be true ! If I were there , I would ask him if he himself was a successful man .
Person2:Nobody would drive him up a wall by asking him such a question , you know .

Output: formal

Input: Consider Input: Person1: How may I help you ?
Person2:I need to get on the Internet .
Person1: Do you have your library card with you ?
Person2:Yes , I have it .
Person1: You ' re going to have to wait for a computer .
Person2:That ' s okay .
Person1: Please put your name on this list .
Person2:Then what do I need to do ?
Person1: When there is a computer available , I will call you .
Person2:What do I do to log on to the computer ?
Person1: Just type in the number on the back of your library card .
Person2:Okay . Thanks for your help .
Output: informal