Auction Site

I would like to create an auction based website for holidays.... The holiday purchaser is the person who makes the listing and holiday operators in turn bid to provide the specific holiday requested. EG. I want to go in June for 10 days stay at a 4 star resort in Thailand' Phuket... The auction will be a dutch auction so the price reduces to show the lowest quote As a seller, they will be able to go through each offer and get into contact regarding the holiday The tour provider will be able to save templates of holidays and bid in any auction that matches the holiday descriptions. Eventually, the site needs to charge tour operators a daily fee, and take i ad revenue.