user: Question: What is the original air date of season 18?
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: [24.0, 1.0, '"Summer in the City"', 'David Von Ancken', 'Pam Veasey', 'September28,2005', '13.30']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "No. in season" = 18.0;