user: Question: Which ICAO is found in Vavuniya?
Columns: ['City', 'Country', 'IATA', 'ICAO', 'Airport']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Ampara', 'Sri Lanka', 'GOY', 'VCCG', 'Ampara Airport']
SQL:

assistant: SELECT "ICAO" FROM "Table" WHERE "City" = 'Vavuniya';