The prices and dates featured on the display ad should be the same as last searched. The url should direct users to the booking engine with the same dates and prices that are featured in the advertisement, not to different dates. Only available dates should be featured, don't promote dates that are unavailable. It is not a great user experience to see dates and price in the ad and be directed to a booking engine without the same price and dates. In addition, for dates that are not available.