Dear Sarah,
Thanks so much for reaching out! It was lovely to hear from you, though I am really sorry to say that I cannot babysit for you this coming Saturday. I have already promised to help my sister move into her new flat that entire weekend, so my schedule is completely tied up.
However, I would still love to help you out if you are still in need of someone. I am completely free the following weekend, so if you haven't made other arrangements by then, please let me know and I would be more than happy to step in.
Regarding your question about my hourly rate, I usually charge £12 per hour for babysitting. That covers everything from keeping the little ones entertained with games to preparing dinner and getting them ready for bed. I am quite flexible with that rate, though, so please don't let it be a deciding factor if you are looking for someone else.
I hope you manage to find someone for this Saturday, and do keep me posted about the following weekend!
Best wishes,
Jamie