user: Question: What is the original air date for episode 15 of season 6?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [119.0, 2.0, '"Room Service"', 'Kenneth Fink', 'Dustin Lee Abraham & Henry Alonso Myers', 'September29,2005', '28.00']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "No. in season" = 15.0;