Calendar Application for Reservation

I need a calendar application created that would be housed online and would have a "front end" public view and and "admin" section to update the calendar. I will be using this application to make reservations. There won't be any credit card processing in the reservation. I would like to have a calendar that I can populate with inventory of wetsuits that will be rented. A user will be able to see the calendar and see if the size of wetsuit that they need is available. If it is available on that date they would click a RESERVE button and it would take them to a form that would email me a reservation confirmation and it would link them to our ecommerce check out. Once the users reserves the wetsuit on a given day I would like it to update automatically so the inventory shows correctly at all times. Once a certain size is sold out for a given day I would like it to say SOLD OUT. The application would need to be server compatible and would need to be written in asp or something compatible. I've created a mock up of the calendar to show an idea of what I am thinking of. Thank you for your bids!