user: Question: What is on the at 8:00 on the same channel that has Costello on at 8:30?
Columns: ['7:00', '7:30', '8:00', '8:30', '9:00', '9:30', '10:00', '10:30']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['On the Arts', 'The Health Show', 'Marketplace', 'Venture', 'the fifth estate', 'the fifth estate', 'The National', 'The National']
SQL:

assistant: SELECT "8:00" FROM "Table" WHERE "8:30" = 'Costello';