user: Question: Which date has a Kickoff [a] of 4:00, and an Opponent of Detroit Lions?
Columns: ['Date', 'Opponent', 'Result', 'Kickoff [a ]', 'Game site', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Date', 'Opponent', 'Result', 'Kickoff [a ]', 'Game site', 'Attendance']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Kickoff [a ]" = '4:00' AND "Opponent" = 'Detroit Lions';