user: Question: What's the original airdate of the episode directed by Pete Travis?
Columns: ['#', 'Episode', 'Writer', 'Director', 'Viewers(millions)', 'Original airdate']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [7.0, 'Episode 1', 'Mike Bullen', 'Tom Hooper', '8.08', '26September1999']
SQL:

assistant: SELECT "Original airdate" FROM "Table" WHERE "Director" = 'Pete Travis';