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'.

[Q]: 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 !
[A]: informal

[Q]: Person1: We're leaving now .
Person2:Here's your bill .
Person1: Right . And would you please forward our mail to this address ?
Person2:Certainly .
Person1: Thank you . Goodbye .
Person2:Goodbye . Hope to see you again .
[A]: informal

[Q]: Person1: So do you believe in palmistry ?
Person2:Palmistry ? What is that ?
Person1: It's when someone takes a look at another person's palm to tell the future .
Person2:Oh , you mean palm reading . I've seen that before , but I don't believe in it .
Person1: Are you sure ? I've read a lot about palmistry and I've been able to tell a lot of accurate things about a person from his palm . Do you want me to take a look at your hand ?
Person2:Really ? You've read books about it ? Ok , then . But only if you want to .
Person1: Ok , let's see , well , you've got a long life line , which is good , and the love line is strong ...
Person2:What else do you see ? Will I be successful ? Will I make a lot of money ?
Person1: Hmm , hard to say , wait , yes , it looks like you will do well in business , and your ambition will help you a lot , but ...
Person2:What ? What is it ? What's the matter ?
Person1: You seem to have a large gullibility line . You believe everything that you're told .
[A]:
formal