求助：吉隆坡skybus更改的问题

我的行程 17/01/2014 AM8:55 LCCT 原先订的是skybus一程从lcct到kl sentral 17/01/2014 AM11:30 bus to Malacca,River Panoramic GH 18/01/2014 PM13:00 bus to Kuala Lumpur,My hotel@Kl sentral 19/01/2014 AM bus to LCCT 现在想改成skybus一程从kl sentral去lcct 19/01/2014 AM 6:50 from LCCT to Siem Reap给info@skybus.com.my发信，得到的回复如下：The Skybus tickets is an open ticket. You can use it at any time on your travel date.Please be at the terminal at 30mins before the bus departs. Thank you very much. Kind Regards,CassieSkybus Ventures Sdn Bhd
---------------是不是说我随时可以坐，只要买了票，任何时间上车去哪里都ok??有没像我这种情况改日子改行程的，可行么？我怎么网上查的好像说要他们给你发个信啥的？还是我把这信打出来带上就成？？？