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'.

Ex Input:
Person1: Good evening . Welcome to our program .
Person2:Thank you . Good evening , Mr.Dean .
Person1: Would you tell us your name , please ?
Person2:I'm Helen Baker .
Person1: Glad to meet you , Ms.Baker .
Person2:Glad to meet you , too .
Person1: Where are you from , Ms.Baker ?
Person2:I'm from New Zealand .
Person1: What do you do for a living ?
Person2:I'm a teacher .
Person1: Thank you for coming , Ms.baker .

Ex Output:
informal

Ex Input:
Person1: Hi , United Airlines ? This is Elizabeth parks calling . I have a reservation on the 2:30 p . m . flight to Shanghai this afternoon .
Person2:Yes , Miss Parks ? How may I help you ?
Person1: Well , I ' d like to reschedule my flight for the tomorrow morning one at 9:05 . Is that possible ?
Person2:I ' m very sorry , Miss Parks , but the 9:05 flight is completely booked . I can put you on a waiting list if you would like .

Ex Output:
formal

Ex Input:
Person1: I see that there are Olympic mascots in your car .
Person2:Yes . I am very interested in the Olympic Games , and I'm especially excited about 2008 Beijing Olympics .
Person1: Me , too . I want to be a volunteer for 2008 Beijing Olympics .
Person2:That's cool . Care for a little quiz on that ?
Person1: No problem . I'm an ' Olympic expert ' .
Person2:Wow , you've talked the talk . Now it's time to walk the walk . Here we go . First , can you tell me something about the ancient Olympics ?
Person1: The ancient Olympics originated in ancient Greece .
Person2:Good . Why do people name it Olympics ?
Person1: They name it after the place where it was first held .
Person2:Who started the modern Olympics ?
Person1: This question is a piece of cake . A Frenchman named Baron de Coubertin .
Person2:What did people call him ?
Person1: Of course he was called ' the father of the Olympics ' .
Person2:What did he do for restoring the Olympics ?
Person1: He once made a speech on the ' Renaissance of the Olympics ' .
Person2:Well , that's for all . Excellent !
Person1: I've told you I'm an expert .

Ex Output:
informal