user: Question: Who is the opponent of game 54, which was in Los Angeles and was before day 18?
Columns: ['Game', 'Date', 'Opponent', 'Score', 'Location/attendance', 'Record']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [49.0, 1.0, 'Detroit Red Wings', '8-6', 'Detroit', '21-24-4']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Location/attendance" = 'Los Angeles' AND "Date" < 18.0 AND "Game" = 54.0;