A : you have taken the wrong direction. You have to wait till we reach the next stop and change trains
B : Thanks a lot
Place : train
speaker A : collector
Speaker B: passanger
Func : providing information / expressing necessity / thanking
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A : How can I help you?
B: I'd like to make an appointment to see a doctor, please.
A:Please hold on for one minute.
Place : clinic
speaker A :assistant
Speaker B:patient
Fun : offering help / polite request
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A: you should pay a fine
B: why
A: As parking here is forbidden
Place : street
speaker A :police officer
Speaker B:driver
Fun : expressing necessity / ask and answer
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A : I wonder if I could find this spare parts for Toyata in stock
B : Sorry sir, we only deal in Hyundai
Place : spare parts shop
speaker A :customer
Speaker B:sales assistant
Fun : polite request / turn down a request