请帮忙翻译这断关于E-appointment的话

snowlady · 发表于 8-5-2013 00:41:49|来自：新加坡

Changes will have to be made 1 day before the appointment date. If you have either made 2 changes to your appointment date/time or missed 2 appointments, you will not be allowed to make further changes or any new appointment.

我的理解是：要想改日期最晚是要提前一天，如果改了2次或取消2次就不能再改了。
是这个意思吗？如果我定了又cancel,再去make appointment,这样算一次吗？