Hello @joole and a very warm welcome to the Community Forum. I am very sorry to hear that your sitter has just cancelled. What reason did they give for cancelling?
Cancellations without good reason should always be reported to Membership Services. Cancellations where the sit has been confirmed through the website with both parties having officially agreed and accepted the arrangement.
For reference, as a member, you can also add your TrustedHousesitters profile on to your Forum profile by following the attached link, should you wish. This will then enable others to offer you helpful advice and feedback and will also give your listing extra exposure.
You do still have plenty of time to find a new sitter/s and I have my fingers crossed for you 