Do not remove the time slot when slots are already full. Blur it out or make it unclickable instead .O

Our earliest time slot (11am) gets full the quickest whenever its full already the option disappears from the list which makes the second option (12pm) look like the earliest slot. This causes confusion among my customers and they keep requesting for us to deliver earlier, thinking that the 12pm time slot is our earliest and not knowing that the morning slots are already full. Please look into this simple change. Thanks!