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'.

Example Input: Person1: Do you surf online regularly , Joe ?
Person2:Of course . I stay online for four hours at least every day .
Person1: Are you crazy ? What are you doing four hours online ?
Person2:Millions of things . I surf the Net , check my e-mail , and most importantly , I chat with my friends .
Person1: Online chat ? Aren't you afraid of meeting bad people who pretend to be what they are not ?
Person2:No , I am not . And I love to meet new people in the chat rooms who share a lot in common with me .
Person1: It sounds interesting .
Example Output: informal

Example Input: Person1: Well , Peter , you have to do better than that next time , won ' t you ?
Person2:Have I really got to do those exams again , Dad ?
Person1: Of course , you have . You must try harder this time .
Person2:And must I go back to school ?
Person1: No , you needn ' t do that . You ' d better get a part-time job somewhere and go to evening classes .
Person2:But Dad , I should be working full-time at my age . I ' m nearly 17 .
Person1: You ought to have worked harder then you wouldn ' t have failed your exams . You have to take a job and study .
Person2:What else I ' Ve got to do ? Join the army ?
Person1: Who knows ! That might come to later .
Example Output: informal

Example Input: Person1: Hey , May , how are you doing ?
Person2:Oh , I'm a little busy these days .
Person1: Why is that ?
Person2:Don ' t you know Christmas is coming ? I have a lot of things to get ready .
Person1: But you ' re in China . Are you planning on going home for Christmas ?
Person2:Yeah , so I have to buy presents for everyone before I leave .
Person1: Why not just give them money in red envelopes ? That would be much easier .
Person2:Americans don ' t like giving money , they prefer presents you buy for them . So I have to figure out what to buy for all of my family and friends .
Person1: I've got it . I won ' t bother you any more . You ' d better hurry to do it , Christmas is just around the corner .
Person2:I will . Merry Christmas .
Example Output:
informal