user: Question: Who was Melbourne's away team opponent?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Collingwood', '19.20 (134)', 'Fitzroy', '12.9 (81)', 'Victoria Park', 25759.0, '24 April 1971']
SQL:

assistant: SELECT "Away team" FROM "Table" WHERE "Home team" = 'Melbourne';