I can't change the dates of my stay. 我无法更改住宿的日期。

　　Sorry, we're fully booked on that date. Can you make it another date? 抱歉，当日的房间都被订光了。您能改期吗？

　　How about the 19th? 那么19日呢？

　　Is it possible for you to change your reservation date? 您可不可以改变预约日期呢？