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

### Instruction:
On what date was there a game in which the opponent was the Detroit Tigers, and the attendance was 38,639?

### Inputs:
table_name: table, columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Record']

### Response:
SELECT Date FROM table WHERE Opponent = detroit tigers AND Attendance = 38,639