根据给出的单词和提示,编写一段对话．

Firstly,before you go to the post office,you must first take a bus to there.You need to find a bus stop.Turn right from the cinema,go straight until you reach to a bookstore.Turn left to the pathway.Walk through the pathway until you see a bus stop.You must wait for the bus no.123.After the bus arrive,ride on it until you reach to a bus stop which opposite of a gym center.Walk down from the bus,then turn right.Walk through the street until you reach to a traffic light.Cross through the road then you will arrive to the post office.