On the RC App for my upcoming cruise (Harmony) it shows that the early dining in the American Icon Grill is 5:00-6:30. The other main dining room levels show 5:00-5:30. Does this mean that we can arrive to be seated anytime during this window, or will it be set once we are on the ship? Is there a way to request the American Icon Grill to have the wider time window for seating?