If you see NOTHING and are getting close to cut off to book - book anything you can where you are willing to do a cheap Southwest or other flight to do the appt (don't book the air yet though) - then keep trying to get a closer in local appt. Pretty much assure you if you look every 2-3 hours when centers are open you will see closer in dates appear as prior poster suggested. These are cancels or walk in's or consolidates for multiple people where the user is now interviewed and the original interview opens up right away