user: Question: What date had a tie no of Replay, and an away team of Watford?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Darlington', '2–1', 'Chester', '16 December 1978']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Tie no" = 'Replay' AND "Away team" = 'Watford';