I booked a flights from Dublin to Austin TX with Vayama to nurse a terminally ill relative after an operation. The dates for the operation have changed hence I wanted to change the dates. On first contacting Vayama they told me that the date changes i gave them would cost me 900euros and I only paid 748.88euros and on contacting them the 2nd time they insisted that there were no flights available on a number of dates that I gave them. I checked out the dates in question on their website and there is plenty of availability and the flights are cheaper than what I paid. They kept insisting that as of now fares are not available to make changes. I queried that there was plenty of availability and they keep responding that what you see on the website is new flights. On my e-ticket it stated that changes at any time, changes permitted for reissue/revalidation. Changes allowed, If changing to a higher fare class pay any fare difference. I am in desperate need to get this issue resolved