CREATE TABLE table_46721 ("Game" FLOAT, "Date" TEXT, "Team" TEXT, "Score" TEXT, "High points" TEXT, "High rebounds" TEXT, "High assists" TEXT, "Location Attendance" TEXT, "Record" TEXT)

Who had the high assists when the game was at American Airlines Center 20,223?
SELECT "High assists" FROM table_46721 WHERE "Location Attendance" = 'american airlines center 20,223'
SELECT "High assists" FROM "table_46721" WHERE "Location Attendance" = 'american airlines center 20,223'