Can make it so that if a particular Service has no available time slots, it would notify us ahead of time in that screen (eg: the service is grayed out or shown in a different color) to indicate that there is nothing available for that physician so they don't have bother selecting it and then choosing "ok" to try to find an open slot.
Similar suggestion when you choose "By Service" first and then "the Staff"
Also, can we allow user to select more than one "By Service" and "the Staff"?
Can you confirm if you are referring to appointment booking in the Portal?