You cannot delete your account.
First, anonymise your account using the tip below, then try the contact form found here: http://www.agoda.com/info/contact_agoda.html
URLS:
http://agoda.com
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.