How Can I Cancel A Reservation

Neither we (Help Owl) nor Trivago does any booking. You need to communicate with the booking company or site. To identify it, you should be able to find its name on your booking confirmation email.

If you can't find your confirmation email, you can always search on Trivago for the hotel and dates you booked, to identify the booking site you made your reservation with. You may also be able to find more information by looking in your browser history for the day you made the booking. You can also try checking your credit card or bank statement, as the name of the booking site you made your reservation with may appear next to the outgoing payment.

If you still can't find the booking site, it's worth a try to call or write Trivago--see the contact information here: https://www.contacthelp.com/trivago/customer-servi....

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Trivago is only a price comparison site. You need to go to the booking site itself. There should be a website or some kind of contact details in your confirmation email