Help me in solving GSQ68B problem

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My issue

Wrong Answer

My code

SELECT 
    c.Customer_id,
    c.Customer_Name,
    c.Customer_Age,
    p.Purchase_id,
    p.Customer_id AS Purchase_Customer_id,
    p.Purchase_amt,
    p.Last_purchase_month
FROM Customer c
LEFT JOIN Purchase p
    ON c.Customer_id = p.Customer_id
WHERE p.Purchase_id IS NULL;

Learning course: 212CSE2305: Database Management Systems
Problem Link: https://www.codechef.com/learn/course/kl-dbms-cs-2024/KLDBMS2420/problems/GSQ68B