user: Question: What is the series number for the episode written by Kristen Dunphy and David Ogilvy?
Columns: ['Series #', 'Episode #', 'Title', 'Written by', 'Directed by', 'Viewers', 'Original airdate']
Types: ['real', 'real', 'text', 'text', 'text', 'real', 'text']
Sample row: [7.0, 1.0, 'The Lost Boy', 'Kristen Dunphy', 'Peter Andrikidis', 193000.0, '13 October 2009']
SQL:

assistant: SELECT "Series #" FROM "Table" WHERE "Written by" = 'Kristen Dunphy and David Ogilvy';