8老師,您好。我父母去年在廣州通過了綠卡麵試,要求今年4月份前來美國,但是他們來美國的飛機由於新冠的原因被取消,來不了,請問我應該怎麽給他們辦理延期,謝謝。
-Read this site for more contact information on phone#, email contact, etc.:
https://china.usembassy-china.org.cn/visas/immigrant-visas/contact-us/
You may email and also call them.