user: ### NOW ANSWER:
Question: Which Commenced operations have an Airline of Valuair?
Columns: ['Airline', 'IATA', 'ICAO', 'Callsign', 'Commenced operations']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['Jetstar Asia Airways', '3K', 'JSA', 'JETSTAR ASIA', 2004.0]
SQL:

assistant: SELECT "Commenced operations" FROM "Table" WHERE "Airline" = 'Valuair';