To cancel your P&O Cruises booking, log into My P&O Cruises, go to My Orders, and select Cancel. If booked through a travel agent, contact them directly. For Carnival cruise cancellation, log into your account, go to Manage Booking, and click cancel Carnival cruise online. To learn how to cancel Carnival cruise or check cancellation terms, call +1-888-653-0010 (OTA). https://pub39.bravenet.com/forum/static/show.php?usernum=3328490884&frmid=10649&msgid=1085685&cmd=show