booking business cars or meeting rooms plugin

Hello everyone,
I’m looking for a plugin (free of course :)) which could help me to edit a booking page on my wordpress site. It’s for an intranet. I’d like users to book cars. I’d like someting like a month calendar in which they can see which car is free and then book the one they want. I’d like them to book with hours or days as they want.
I know web reserv but with it I can manage only two issues for free.
Thank you
-EM-