Urgent-must cancel GMAT test

Hi,

Urgent-This morning I got the announcement that tomorrow I will be out of country on business trip with my director team until come back U.S on May 29, this is big ....bad news for me because I have GMAT test on May 27. Now I must start my business trip after negotiating with my director.

Can I now cancel the GMAT test? anyone here know how to cancel the GMAT test and can I get the money back, could you please tell me?