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: So did you get in touch with your brother ?
Person2:No , not yet . I'm really worried .
Person1: Well , it'd be foolish to call the police . He probably just went away overnight .
Person2:Maybe you're right . But I'm still worried .

SOLUTION: formal

PROBLEM: Person1: Charles , have you finished your homework ?
Person2:Not yet , Grandma , What's the matter ?
Person1: I want you to have a walk with me .
Person2:I'll finish soon .

SOLUTION: formal

PROBLEM: Person1: At what age do children start school in your country ?
Person2:At five .
Person1: Do boys and girls go to school together ?
Person2:Yes , they do .
Person1: Do you think this is a good idea ?
Person2:Yes , I do .
Person1: Do some children go on to university ?
Person2:Yes , they do .
Person1: What examinations do they take first ?
Person2:O levels and A levels .
Person1: How long do you usually stay at university ?
Person2:Three or four years .

SOLUTION:
formal