user: Question: What is Date, when Away Team is "Brentford"?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Liverpool', '4–0', 'Brentford', '18 March 1989']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team" = 'Brentford';