The process of selecting seats and completing an order takes a few minutes and your tickets are held for you during this period. If another customer decides they no longer want their seats, their seats will be released back on sale for another customer to select.
Tickets can sometimes be released a few weeks before an event date and this is often because we might get an allocation returned from a ticket agent, or tickets held for the promoters/producers are no longer needed.
Unfortunately we cannot offer any exchanges in these instances, so please make sure you are happy with the tickets you select before you complete your purchase.