Hi I just saw email saying I purchase song on first witch is not in my knowledge I was Travling back from Dubai to uk I was in Flight ek003 at that time can that purchase be cancelled

You are sure that it was a genuine email from Apple and not a phishing attempt trying to get your account and payment details ?

Phishing and similar emails : Phishing & Other Suspicious Emails

Phishing emails : Identifying fraudulent "phishing" email - Apple Support

Genuine iTunes emails : Identifying legitimate emails from the iTunes Store - Apple Support

Viewing your account's purchase history : See your purchase history in the iTunes Store - Apple Support

If it's a genuine email and it shows on your account's purchase history, and nobody else has access to your account or devices/computers, contact iTunes Support : https://support.apple.com/contact . And change your account's password http://appleid.apple.com - after changing it : What to do after you change your Apple ID email address or password - Apple Support.

If it is a phishing email you could forward it to Apple : reportphishing@apple.com , and then delete it.

If it's a phishing attempt and you clicked on the link in the email and entered your account id and password change the password immediately