user: Question: What date has Dallas Cowboys as the opponent?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 3, 2000', 'Carolina Panthers', 'W 20-17', 'FedEx Field', '1-0', '80,257']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Dallas Cowboys';