申请I751表格两年了，延长信已过期，预约I551 infopass预约不上怎么办？

我的绿卡延长信上个月底已经过期，由于国内有急事，需要出境，于是11月份在网上联系了EMMA，申请I551 INFOPASS，要求等待30天，上周又联系emma，说是紧急事情需要出境。于是今天就收到一封邮箱，内容是We are contacting you about your pending request to be scheduled for an in-person appointment at a USCIS field office. Unfortunately, there are no available appointments with the field office that you need to visit. We apologize for this inconvenience and appreciate your patience.



Please note that we process all requests for appointments in the order in which they were received. We ask that you wait for the Contact Center to reach out rather than calling back to check on your request as it may result in longer wait times.  
As soon as an appointment becomes available, we will:
Send you an email with the date and time if it is determined you are eligible for an appointment; OR  
Contact you by phone or email to confirm that the appointment is still needed, and if so, schedule as appropriate.
If you have an application pending for a green card, please continue to monitor your case status using our online tools and contact us if the appointment is no longer needed.
很想知道有没有什么办理可以尽快拿到infopass的盖章，家中有急事。好烦。希望有经验的朋友可以给个意见，感激。#infopass