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Dear Valued Partner
Dear Valued Parter,
Please kindly cancel the following reservation due to it was a double booking.
Booking.com reservation number: ***-***
Name of guest: ***
C/I: 15th, July
C/O: 16th, July
If you have any further question feel free to contact us again at your best convenience.
We hope to see you soon.
Best regards,
Front desk Liao
Heya,
Double bookings needs to be dealt with via Booking.com directly. Sadly you need to send this message via your Extranet -> Inbox -> Booking.com messages.
I also doubt they will cancel a booking when it is a double, they have very strict rules.
Perhaps go and check out the FAQ section on the forum about Double bookings.
Keep well and best of luck!