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: what are you doing ?
Person2:I'm just trying to complete today's crossword puzzle . Whenever I get the time , I like to do the crossword puzzles in the paper .
Person1: you really like brains that make you think , don't you ?
Person2:I guess you could say that . What kind of games do you like ?
Person1: I guess the games I like the most are the ones that I'm good at !
Person2:Doesn't everyone ? Which games are those ?
Person1: Well , I like to play darts . Whenever I go to a bar , I usually play for a few hours .
Person2:Did you play a lot of games when you were little ?
Person1: My parents used to love to play checkers and dominoes . We used to have family tournaments every weekend .
Person2:Do you still like playing those games ?
Person1: Not at all . I never really did , to be honest . What about you ? Did your family used to play games together ?
Person2:Everyone in my family really enjoys playing card games .
Person1: Some of my friends play cards on the internet . Have you ever tried that ?
Person2:No , I prefer to play with people I know .
Person1: How about mah-jong ?
Person2:It's a popular game with some people , but I've never played it .
Person1: I thought everyone in your country were experts at mah-jong !
Person2:I hate to disappoint you , but unlike what most people think , we aren't all exactly the same !

Ex Output:
formal

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: Acknowledgments play a necessary part in the interview .
Person2:Sure . Kind acknowledgments can show one's good attainment .
Person1: We often ignore the acknowledgments in our daily life , and consider them as disposable .
Person2:Actually , that's not true . Acknowledgments can help you leave a good impression on others , especially in the public places .
Person1: We should particularly pay attention to acknowledgments in the interview .
Person2:In the beginning of the interview , it is best that you make acknowledgments for the opportunity of the interview .
Person1: Don't forget to say " Thank you " when you take a seat .
Person2:Make acknowledgments as well when the interviewer thinks highly of your dressing , experience , or words .
Person1: You can win a good impression of the interviewer in this way .
Person2:Acknowledgments can also help the job-hunters to show their good attainment .
Person1: Finally , at the end of the interview , make acknowledgments to the interviewer again .
Person2:Smiles and kind attitudes are the basics of acknowledgments .

Ex Output:
informal