user: Question: What is the production code for the episode that aired on October 15, 2004?
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [24.0, 1.0, '"Only Connect"', 'James Hayman', 'Barbara Hall', 'September 24, 2004', 201.0]
SQL:

assistant: SELECT "Production code" FROM "Table" WHERE "Original air date" = 'October 15, 2004';