Hi,
I'm trying to create a form so the employees can book a pool corporate car. In the form they need to state their pickup and return date and select the car from a list.
I want the form to check the availability of the selected car for the selected period based on existing bookings (i.e. availability of the selected car on the calendar).
I tried to achieve this through Rules, but it seems to me that I can't set a rule to do this for me.
Can you please help me to get this done?
Thanks 
