user: Question: What is the ICAO of Douala city?
Columns: ['City', 'Country', 'IATA', 'ICAO', 'Airport']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Abu Dhabi', 'United Arab Emirates', 'AUH', 'OMAA', 'Abu Dhabi Airport']
SQL:

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