回复：你的主意太有用了！到那里可以查到电话？网上吗？

go to uscis website, click on infopass. You don't even need an A# to make an appointment. It applies to anybody who is currently in US.

My strategy is that if they don't make progress on my application,I will keep bothering them until they approve my case. And It did works! I apply last Dec. and got my card early this month.