@Sam-Hendrika0
You have a few options:
- depending on the cancellation policy attached (check it first !) you maybe can cancel the stay within 48 hours after booking and have a refund.
- You can sent the host a request to shorten the reservation, which is done by the "change" option in your reserveration. Also explain why you want to shorten.
- You can cancel the reservation, the system will calculate the refund (if any !). It all depends on several conditions.
Are you sure you have to share the room with another person ?
BTW
Better not provide private information here, like phone number. It probably will be removed by @Quincy