Does this client require a deposit before the slot is held?
Is this date inside a blackout window for this specific client?
Does the customer meet the eligibility rule for this service?
Is this request inside the allowed cancellation or rescheduling window?
Does this appointment type need a longer slot than the calendar is showing?
Does booking it require a specific credential or certification?
Does this request need a supervisor or manager sign-off before it's confirmed?
Is there a required disclosure the customer needs to hear before the booking is confirmed?
Agent First handles the operational decision, whether this is the right slot for this client, this customer, this request. Your existing scheduling system still handles the calendar itself.
It doesn't replace your booking software. It decides whether the slot your booking software is about to hold is the right one to hold.