user: Question: What is the date of the game where Essendon is the away team?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Fitzroy', '12.8 (80)', 'St Kilda', '16.21 (117)', 'Brunswick Street Oval', 14000.0, '18 May 1929']
SQL:

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