You: Excuse me, sir(/madam).
Stranger: Yes?
You: Could you tell me how can I get to the train station, please?
Stranger: Sure, go down this road until you reach the second intersection and it takes you half an hour to walk there. I suggest that you'd better take a bus.
You: Thank you very much. You do me a good favor.
Stranger: My pleasure. Goodbye.
You: Bye.
希望符合你的要求.