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: Are you excited about your trip next month ?
Person2:Yes and no . I can ' t wait to go to Europe , but at the same time I am terrified .
Person1: Why ?
Person2:Well , I have acrophobia . I have a chronic fear of flying .
Person1: Oh really ? I have an uncle who is also terrified of flying . It ' s not that bad though , I mean , it is pretty scary to be in this big machine flying through the air at seven hundred miles per hour . I actually have arachnophobia .
Person2:You ' re scared of spiders ? I actually have two more phobias . Acrophobia and glossophobia .
Person1: I guess that explains why you are afraid of flying , but public speaking is not that bad .
Person2:Are you kidding ? When I get on stage , my palms start to sweat , I get really nervous and I can hardly speak .
Person1: Well , I must confess I am a bit claustrophobic . I hate being in an elevator for more than 5 seconds .
Person2:We are such weirdos right ?

Output: informal

Input: Consider Input: Person1: Excuse me , is this seat taken ?
Person2:Er ... no , go ahead .
Person1: You work upstair , right ? I think I have seen you before . I'm Karren , Karren Brown .
Person2:Nice to meet you , Karren . I'm Tim Wang .
Person1: Happy to know you , Tim .

Output: informal

Input: Consider Input: Person1: I've been thinking of taking I've been thinking of taking a Crazy English course.Do you think it's a good idea
Person2:Sure ! You should do anything you can to improve your English .
Person1: Really ? Do you think English is that important ?
Person2:Of course it is.In fact , I'll even take the course with you if you want .
Person1: Great ! It's always better to do things with a friend .
Person2:Do you have the phone number ? I need to call for registration .
Person1: No , I left it at home.Sorry !
Person2:That's OK . I can get it from you later .
Person1: So , do you want to go somewhere for dinner and practice our English together tonight ?
Person2:All right . I know a great restaurant near here.But , it's a little expensive and I don't have much money with me .
Person1: No problem . I just got paid.It ' s my treat .
Person2:Thank you ! I'll be sure to return the favor after our first class , OK ?
Person1: Forget it ! That's what friends are for ! Besides , I have a VIP card for a discount .
Person2:Good job ! This is going to be a great night !
Person1: I think so too.Let ' s go !
Output: informal