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: I would like you to meet my family . Can you come to dinner next week at my parents ' place ?
Person2:Yeuks ! Do they know anything about me ?
Person1: Actually , I've told them a lot about you . They are excited to meet you .
Person2:I'm a little nervous !
Person1: I think you'll like them . My family is pretty laid back .
Person2:How Ay people will be there at dinner ?
Person1: Let's see . there's my mom and dad and my two brothers and one of my sisters .
Person2:That's good , I'm usually more comfortable in bigger families .

Ex Output:
informal

Ex Input:
Person1: I can't believe it , I had faith in Bob and he let me down .
Person2:I know what you mean .
Person1: Really ?
Person2:Yes , he did the same to me .

Ex Output:
informal

Ex Input:
Person1: It smells like an ashtray in here !
Person2:Hi honey ! What ' s wrong ? Why do you have that look on your face ?
Person1: What ' s wrong ? I thought we agreed that you were gonna quit smoking .
Person2:No ! I said I was going to cut down which is very different . You can ' t just expect me to go cold turkey overnight !
Person1: Look , there are other ways to quit . You can try the nicotine patch , or nicotine chewing gum . We spend a fortune on cigarettes every month and now laws are cracking down and not allowing smoking in any public place . It ' s not like you can just light up like before .
Person2:I know , I know . I am trying but , I don ' t have the willpower to just quit . I can ' t fight with the urge to reach for my pack of smokes in the morning with coffee or after lunch ! Please understand ?
Person1: Fine ! I want a divorce !

Ex Output:
informal