Need more detials
-- Country of orginating flight -- rules for bumps are based on country of flight departure
-- Flight number
-- Was the type of aircrat changed? or was there a weight issue?
-- At what time was the individual notified and where?
Rule 25 Denied Boarding Compensation
B. Denied Boarding Non-U.S.A./Canada Flight Origin - Where there is an Oversold UA flight that originates outside the U.S.A. or Canada, no compensation will be provided except where required by local or international laws regulating Oversold flights.