Were you dining à la carte or without a reservation? Maybe the later arriving parties had already had their food set aside in the kitchen because they were traveling on a ticket with meals included and/or had a reservation. I travelled only once with bedroom accommodations and recall we were assigned reservation times when to show for our pre-paid meals.
Yes without a reservation. However, the first half of dinner hour was for reservations then they took people in without reservations. By the time we were called, anyone with reservations would have long been accommodated. I understand that food might run out but they could have atleast asked us about drinks.