Task: Text to Code
Input (English): Step 1: find the customer_id of Customer_Orders table.
Step 2: find the customer_name, customer_phone of Customers table whose Customers's customer_id not one of the results of step 1
Output (English): SELECT T1.customer_name , T1.customer_phone FROM Customers AS T1 WHERE T1.customer_id NOT IN ( SELECT T2.customer_id FROM Customer_Orders AS T2 )