TASK DEFINITION: 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'.
PROBLEM: Person1: I don't think much of the film .
Person2:But I think it wasn't too bad .
Person1: Really ? Do you like the story ? It's sheer nonsense !
Person2:It's exaggerated . Actually this sort of thing happens to everyone .

SOLUTION: informal

PROBLEM: Person1: What is the correct time , please ?
Person2:It ' s exactly twelve minutes past seven .
Person1: When will you lecture begin ?
Person2:Begin at 9 o ' clock sharp .

SOLUTION: formal

PROBLEM: Person1: What happened to your brother ?
Person2:It seems that he has gone ape over the girl .
Person1: Your parents must be worrying about him .
Person2:Yes , he ' s been like this for two weeks . We don ' t know what to do .
Person1: Have you talked to him ?
Person2:Yeah . But he just didn ' t listen .

SOLUTION:
formal