美国签证预约时间能改吗？
您好，很高兴为您解答 可以的。但是只能预约相同类型和日期的名额（比如B1/B2，F1或者J1等）而且不可以改到更早的时间。 所以如果你要取消预约，至少也是要提前48小时操作。 下面是我总结的一些关于如何取消预约的步骤，希望对你有帮助！ 如果您有任何问题可以直接在网站里提问(网址是www.visaappointment.com)。这里会很快有工作人员回复你的。然后他们会在网站上直接给你解决。
如果您不想在这里提问的话，我这里还有另外一个办法可供选择就是给移民局写信(网址是URL )。这个信需要写得比较有条理一点，因为你要解释清楚为什么取消预约，以及将来什么时候还会再预约等等。这样工作人员处理起来也会方便很多。
以下是取消预约的信的内容： Dear [ImmigrationOfficer]My name is[name]，I am from[countryoforigin]，Now I live in[city，state]in the United States of America as a student at _________University on an F-1Visa with my Alien Registration Number：____The appointment that was made for me was on_______at______， but due to personal reasons， I will not be able to make it up until sometime later. Therefore， I would like to reschedule this appointment and ask you kindly to help me do so by either changing or canceling this scheduled date time. Kindly let me know if there are any new availability during these dates because I can try to book one then instead If there aren't any other available times between now through February first， please move my case back into processing so I don't have to go through the process all over again. Thank you very much for your attention，and I look forward to hearing from you soon. Sincerely，{Your Name} 我觉得这样的做法比直接在网站上取消预约要好一些，虽然麻烦了一点但是起码可以让移民局知道您的想法并且帮您安排以后的预约。而直接取消预约则会导致系统认为你放弃签证的申请，从而导致你之前的所有努力都前功尽弃了呀。。。