How do I cancel or change my JR train ticket?
Before booking is confirmed: Cancel your booking directly on the Klook App. Go to 'Account' → tap 'Bookings' → Find your booking → tap 'Refund.' If your ticket is in the process of being issued, or has already been issued, you won't be able to cancel.
After booking is confirmed: If your booking is already confirmed, make sure to cancel at least 2 hours before departure and before picking up your tickets.
After picking up your ticket: Once you’ve picked up your ticket, visit the ticket office before your departure time to cancel.