我已经订了7月份去欧洲的游轮和机票，没想到3月中旬申请的转公民5月中旬就要面试了，担心宣誓后会收回绿卡，那我游轮回来就进不来了，订游轮和机票用的都是中国护照，我该要求延期宣誓吗？
-Very few USCIS Field Offices provide both interview/exam and oath ceremony at the same day. Normally the Office wait for certain number of approved cases and then, schedule the oath ceremony for these applicants at the same time.
You of course can request re-scheduling the oath taking. If you cannot attend your scheduled ceremony, you should notify USCIS immediately by returning the notice (Form N-445) to your local USCIS office with a letter explaining why you cannot attend and requesting a new date.
