user: Question: What day did episode number 4 air originally?
Columns: ['№', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '" Pilot "', 'Alex Graves', 'J. J. Abrams & Alex Kurtzman & Roberto Orci', 'September9,2008', '276038', '9.13']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "№" = 4.0;