user: Question: What is theoriginal air date of the episode directed by Timothy Van Patten?
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Musical guest and song', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [56.0, 4.0, '"Blue Boy"', 'Frederick K. Keller', 'Natalie Chaidez', 'Soraya "Quédate"', 'September 19, 1996', 'K1504']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "Directed by" = 'Timothy Van Patten';