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'.

Let me give you an example: Person1: Hey man , you wanna buy some weed ?
Person2:Some what ?
Person 1:Weed ! You know ? Pot , Ganja , Mary Jane some chronic !
Person2: Oh , umm , no thanks .
Person1: I also have blow if you prefer to do a few lines .
Person2: No , I am ok , really .
Person1: Come on man ! I even got dope and acid ! Try some !
Person2: Do you really have all of these drugs ? Where do you get them from ?
Person1: I got my connections ! Just tell me what you want and I ' ll even give you one ounce for free .
Person2: Sounds good ! Let ' s see , I want .
Person1: Yeah ?
Person2:I want you to put your hands behind your head ! You are under arrest !
The answer to this example can be: informal
Here is why: Based on the conversation, we can see that there is a presence of exclamation which is not present in a formal discussion. Therefore this is an informal conversation

OK. solve this:
Person1: Ok , so who are we going to invite to our dinner party ?
Person2:Well , we have the Thompsons , the Greens , and the Anderson , about twelve people total .
Person1: Don't forget my friend Andy from the office . He has nothing to do on Friday , so I invited him over .
Person2:But that makes thirteen people ! We can't have thirteen people for dinner on Friday !
Person1: Why can't we ?
Person2:It's an old superstition . If we have thirteen people at the table , then it means bad luck . Can Andy bring a date ?
Person1: I'm not sure . He just broke up with his girlfriend recently , and I don't think he's in the mood to start again so soon .
Person2:But we can't have thirteen for dinner !
Person1: I think you're making a mountain out of a molehill . It's only a superstition . It really doesn't mean anything .
Person2:Absolutely not ! I refuse to have thirteen people for dinner on Friday !
Person1: Ok , ok . I'll ask my sister to come . That way we'll have fourteen for dinner .
Person2:That's better .
Answer:
informal