How to change sitter?

Hello Mr. Rover I have a problem here. I have already booked and paid with a sitter by the name "XI - C ". But so far we got no response from her. So, as you see, it is all set from my side. But no response from "XI-C"
My question is: Having in mind that I already paid, but having no response from "XI - C" , how can I transfer the payment to another sitter by the name "Sunil & Amita K" I am David da Silva dsretrieved1@gmail.com 905-495-2032 647-517-4222 Cell