user: Question: What is the IATA for Nanjing?
Columns: ['City', 'Country', 'IATA', 'ICAO', 'Airport']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Bangkok', 'Thailand', 'BKK', 'VTBS', 'Suvarnabhumi Airport']
SQL:

assistant: SELECT "IATA" FROM "Table" WHERE "City" = 'Nanjing';