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'.

Example Input: Person1: I really dislike reading academic books .
Person2:That may be so , but reading them is an important way to expand your knowledge .
Example Output: informal

Example 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 !
Example Output: informal

Example Input: Person1: Hi , is you , John ?
Person2:Oh , Jane . What on earth have you been ? I've called you a thousand times .
Person1: Sorry , John . I suddenly got a severe stomachache last night , and stayed in hospital the whole day .
Person2:But I called your cell phone , and there was no answer .
Person1: I know , I left it at home .
Person2:Do you feel better now ?
Person1: It's OK now . Don't worry , John .
Example Output:
formal