3分钟英语对话:Asking the way

A:Excuse me,would you please tell how i can get to the nearest post office?
B.Post office...Oh.i see.But it may take you about half an hour to get there.
A:that is ok.
B.walk along this road until you see a bus stop on your left hand.and you can take No.19 bus Remember to get off at the third stop.and then come across the road.i believe you can arrive at the post office in ten minutes walk.
A:walk along,No,19 .the third stop.come across.ten minutes walk?
B yes,that is it .you can not miss it.
A i won't .thanks
B you are welcome .