I have just arrived at Valencia Airport and wondered if you have any cars available today until Saturday?
Try the website and insert a pick up time of at least one hour from now, even though you can pick up the car sooner.
The following instructions may help:-
Enter your search criteria ( dates, times, location) and click on SEARCH.
The first thing you will see is a filter were you can filter the results by car size, for example 7,8 or 9 seaters or convertibles where they are available.
A credit card is required.
If no car photos are displayed, then adjust your date/time. Like I said: at least one hour from now!