Airline and Hotel Booking System PHP5 and XML

We are looking for a PHP + AJAX + XML developer to develop an online flight and hotel booking system (clone) similar to sites like [login to view URL], [login to view URL] and www.expedia.com. We require you to design the database (mysql) and use the latest coding practices (Object oriented code) in php5. Procedural programming will not be accepted. We do not require design work to be done (including HTML front-end), just the raw site, just the data neatly displayed, along with the booking system so that our in-house team can work on it. You will be required to tie in 3rd party web services API's (XML/ Soap like Sabre GDS) to which you will connect to, to search and book flights and accommodation. Ajax should be used to display and filter result sets and in search boxes. The system should also have the functionality to mark up the fares retrieved through the web service. We should also be able to offer our own travel packages on the website through the admin section. For a better understanding on what we require, please visit the above mentioned sites. We would also be willing to consider source code which you may have used in a similar project in the past, however, it should satisfy the coding criteria mentioned above. We will only consider people who have worked on similar projects before and only people who can provide examples of the sites they have worked on. We have had a bad experience with freelancers before, so please do not expect us to pay for it upfront or have unreasonable terms of work. We look forward to receiving your quotes