Activity reservation software with special area for clients

I need to develop a reservation software that can be integrated into several websites. I would like it to be similar in functionality to the software offered by zaui.com. i want to be able to allow multiple vendors to log in and provide their inventory as well as customize their profile page and sales page. i would also like the client to be able to log in as an affiliate and block periods of time for groups and later those individual spots can be access and paid for individually. i want it to feel like you are not leaving the site when you access the database for reservations much like the numerous airline reservation sites on the internet. vendors need to have the ability to customize their reservation inventory much like innotopia.com. please review all this information before placing a bid on this project. I also want the site to be able to be "wrapped" into various other sites, as this reservation system will be available for my clients to post on their website and meld into their design layout. I am not sure what type of programming this requires so please feel free to bid if you think you can handle this project.