孩子还在加拿大上学， 六月底才能回国，不能请假一起去面试。请问申请改期面试是去网站还是打电话？ 可否给个网站链接，或电话号码。广州领事馆网站搜索不到相关信息。十分感谢！
Read the following at this link:
U.S. Consulate General Guangzhou, China - GUZ (state.gov)
Rescheduling or cancelling your interview
If you are unable to attend your appointment, please email us as soon as possible using our online inquiry form. There may be a significant wait before the next available appointment, so please attempt to attend the date already assigned. For some family-based and employment preference visa categories, a visa could become available within the month you have been scheduled by NVC. There is no guarantee that a visa will still be available on the date of your rescheduled interview. Please carefully consult the Visa Bulletin before you decide to reschedule you interview.
