Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is Date, when Competition is "F", and when Opponents is "FC Astoria Walldorf"?

### Inputs:
table_name: table, columns: ['Date', 'Venue', 'Opponents', 'Score', 'Competition', 'Match Report']

### Response:
SELECT Date FROM table WHERE Competition = f AND Opponents = fc astoria walldorf