回复：一定要亲自去改日期

非常感谢你的建议。请看下面一段话：

"If you absolutely cannot make it to a scheduled
interview that we requested, call customer service before the interview date as far in advance as possible. However,please understand that rescheduling can delay processing. We will only reschedule if emergency reasons outside your control prevent you from keeping your appointment. Certain kinds of interviews cannot be rescheduled. When you call customer service, you will need to explain the reason that makes it impossible for you to keep your appointment. The office where your interview was scheduled will make the decision about whether to grant your request to change your appointment, and will notify you directly."

好象我必须要有个比较紧急的理由才行，不然的话移民官可能会拒绝我的延期申请吧？我这里离local office 倒是挺近的，有人说当面跟移民官谈比较好。不过如果跟打电话没有太大区别的话，还是打电话算了。不用预约，也不用找趴车位，拿起电话来就可以了。听起来老兄好象也有过跟在下一样的悲惨经历，在此表示遗憾，并祝以后的时间里一切顺利!

多谢!