You just need to arrive at the terminal at least an hour before the scheduled departure time to buy your ticket.

您只需在预定起飞时间前至少一个小时到达航站楼即可购买机票。

Here you are sir. Your train leaves from platform number nine at nine on the dot. Remember to be here at least thirty minutes before your scheduled departure time or else you might miss your train!

给你。火车晚9点准时开发。一定要在计划出发时间提前30分钟来，或否你会错过火车。