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'.

Person1: Good afternoon.Swiss Airline.Miss Grown speaking . Can I help you ?
Person2:Yes . I'd like to make a reservation to Los Angeles on Sep . 19th .
Person1: Just a moment , please . Let me check for you . ( A moment later ) Thank you for waiting . I am sorry but our flights are fully booked on that day.The next available flight leaves at 4:00 pm on 20th . Shall I reserve you a seat on it ?
Person2:Yes , please , thank you .
formal

Person1: Hi , charlie , are you busy this evening ?
Person2:Sorry , I'm afraid that I've got plans tonight .
Person1: What are you doing ?
Person2:I'm going to my parents ' house for my father's birthday .
Person1: How old is he today ?
Person2:It's his 50th birthday .
Person1: Well , wish him a happy birthday for me .
Person2:Sure thing . What are your plans for the evening ?
Person1: I was just thinking of going to a movie tonight .
Person2:Well , if you can wait until tomorrow night , I'll go with you then .
Person1: Sorry , I've got people coming over tomorrow night .
Person2:Sounds like this weekend just isn't going to work out for us .
Person1: Sounds that way . Maybe some other time then ?
Person2:Sure.Hey , I'm sorry , but I've got to get going .
Person1: Yeah , me , too . It's about time I made a move .
Person2:Say hello to your friends for me .
Person1: Likewise . See you later .
Person2:Bye !
informal

Person1: Do you think I still fashionable in this dress ?
Person2:I think so . Blue is still very fashionable at the moment .
Person1: This style came out last year , though . I like the dress , but I ' m not sure whether last year ' s fashions will be same this year .
Person2:I think this kind of dress will stay in fashion for a few more years . People don ' t change fashions every year . It would be too expensive .
Person1: Yes . Only the top designer try to tell people to change fashion every year , but only rich people can do it .
Person2:There are some real fashion victims who just have to keep totally up-to-date with expensive clothes .
Person1: I wish I could be one of those people , but my budget simply doesn ' t stretch that far . I have to limit the amount of money I spend on clothes otherwise I would go on a shopping frenzy .
Person2:I know what you mean . The situation will be worse if we marry our boyfriends and have children . The we ' ll have even less money to spend on fashionable clothes !
informal