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因为怕成都实际上不提供Walk－in appointment，所以还是约了明天（10／22）早上9：30的，但是现在已经签到了，所以刚打电话去取消了，有要明天去的，可以试试看是不是又有名额了。
http://www.iflychina.net/visa/interview_story/48007
I only have a copy of I-797A. I am confused when they ask for my receipt number on I-797. Do they actually mean I-797A? The girl on the phone only repeated I-797 no matter what I said.