user: Question: Name the number of going to for  Thurlby, Braceborough Spa at departure being 16.50
Columns: ['Departure', 'Going to', 'Calling at', 'Arrival', 'Operator']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['07.45', 'Essendine', 'Thurlby, Braceborough Spa', '07.59', 'GNR']
SQL:

assistant: SELECT COUNT("Going to") FROM "Table" WHERE "Calling at" = 'Thurlby, Braceborough Spa' AND "Departure" = '16.50';