Customizing URL

[hk]

Hi,

I am using Joomla 2.5 and VM 2.0.18

After adding a item to cart and proceeding for payment, when the payment is declined by system, the website takes to a page with url:
http://<mysite.com>/index.php?option=com_virtuemart&view=pluginresponse&task=pluginUserPaymentCancel&on=30&pm=2&payment_status=DECLINED

How can I customize the naming of this URL to something like http://<mysite.com>/payment-declined

Thanks.