There are open seats on that flight but none of them have four together (yet). There's a good chance you can get the bulkhead seats if you have children at checkin. I was able to hold a reservation and select a seat. The only seats left open are the preferred and preferred plus seats. There are 173 confirmed passengers on that flight with 195 seats open. Rows 26 and 27 have two seats available on both sides of the aircraft. What type of award ticket did you use? If you don't have status I'm not sure what seats you are eligible to select if you used a Miles SAAver award.