1. Check if they have Registered trademark for the word "fluke" in your country. If not:
"The existence of a foreign trademark does not put a domain registrant on notice where the registrant resides in a country other than where the trademark is registered as other WIPO cases show e.g. VZ VermögensZentrum AG v. Anything.com, WIPO Case No. D2000-0527 (Cayman Islands respondent would not have knowledge of Swiss and German trademarks); Koninklijke KPN v. Telepath, Inc., WIPO Case No. D2001-0217, (U.S. registrant could not "reasonably have been expected to know about the complainant or its Benelux trademark."); Deutsche Lufthansa SA v. Greenwald, WIPO Case No. D2001-1456, (German trademark not "so well-known in the United States."); Etam, plc v. Alberta Hot Rods, WIPO Case No. D2000-0016 (German trademark and U.S. respondent)."
2. Also check if that trademark is registered (if exists) before or later your domain was registered, since trademark registration must predate domain registration.
3. And also check for this UDRP cases:
"Neither mere registration, nor general offers to sell, domain names which consist of generic, common, or descriptive terms can be considered acts of bad faith. Shirmax Retail Ltd./Detaillants Shirmax Ltee v. CES Marketing Group, Inc., ICANN Case No. AF-0104; Allocation Network GmbH v. Steve Gregory, ICANN Case No. D2000-0016."