Narrative:

We received and acknowledged a descent clearance from 5000 to 3000. We included call sign in readback. Several mins later we were told to maintain 3000 and that we had taken someone else's clearance. We were the second airplane in less than 5 mins to be advised that we had taken someone else's clearance.

Google
 

Original NASA ASRS Text

Title: FLC OF MLG ON APCH TO DFW ALLEGEDLY TOOK ANOTHER FLT CLRNC FOR DSCNT TO 3000.

Narrative: WE RECEIVED AND ACKNOWLEDGED A DSCNT CLRNC FROM 5000 TO 3000. WE INCLUDED CALL SIGN IN READBACK. SEVERAL MINS LATER WE WERE TOLD TO MAINTAIN 3000 AND THAT WE HAD TAKEN SOMEONE ELSE'S CLRNC. WE WERE THE SECOND AIRPLANE IN LESS THAN 5 MINS TO BE ADVISED THAT WE HAD TAKEN SOMEONE ELSE'S CLRNC.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.