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: Would you like to come over for dinner tonight ?
Person2:Sure , but I have to tell you that I've become a vegetarian . I don't eat any kind of meat .
Person1: When did you decide to become a vegetarian ?
Person2:I saw a program a few months ago about how animals are raised for human consumption . I haven't been able to eat a single piece of meat since .
Person1: That's great . Do you find that you eat a lot more fruit and vegetables now ?
Person2:Definitely . I've also been buying organic fruit and vegetables , which is more expensive , but much better for you because they don't have any pesticides on them .
Person1: You've really turned into a health nut , haven't you ?
Person2:I guess you could say that . Eating fruit and vegetables helps keep you healthy . I've lost 5 pounds and I feel great !
Person1: How do you get enough protein in your diet ?
Person2:Well , I eat a lot more tofu , beans , nuts and some fish .
Person1: Well , don't worry about dinner . I'll only make vegetarian dishes for you . Do you like sushi ?
Person2:I prefer cooked fish to raw fish , but if you really like it , make it .
Person1: How about a spicy tofu and vegetable stir-fry ?
Person2:That sounds great . What time should I come over ?
Person1: Dinner will be ready at about 7:30 pm , so you can come over at 7 p . m .
Person2:Sounds good . See you there !

Ex Output:
informal

Ex Input:
Person1: What is the movie you saw last night ?
Person2:It is a new film , ' Transformer ' .
Person1: How do you like it ?
Person2:I expected too high from that movie , but I was a bit disappointed about it .
Person1: But I heard the box office rose up to 15 million in the first week .
Person2:Box office can't explain everything . I do not think it is cheerful or well-made . The plot is old and the female character is not pretty .
Person1: My sister has given me two tickets for tonight . It is called ' The life of Rose ' , a French movie .
Person2:What's it about ?
Person1: It tells the lifetime of a lady singer from a beggar in the street to a famous singer in the world . It is a kind of tragedy .
Person2:I prefer the tragedy . It is moving and makes me ponder about my life .
Person1: Let's go . The time is coming .
Person2:We can buy the popcorn before entering the cinema .

Ex Output:
informal

Ex Input:
Person1: Hey , Zina . You're here early today .
Person2:Yeah , I'm going to be making phone calls all day . What a blast .
Person1: I just wanted to say thanks for putting us on the map so fast . I appreciate it .
Person2:Save it , Vince . After I put my first million in the bank , I'll say you're welcome .
Person1: Fair enough.Keep up the good work .

Ex Output:
informal