Evie kindly requests that you have a read through her website before contacting her, because you are likely to find the answers to your questions here. There is a lot of information useful to you, such as her services, what you can expect in the booking, her tour dates, available hours, as well as the FAQ page.
Here is a template you could use in your SMS or email, or feel free to customise to something along these lines:
Hello Evie! My name is [NAME]. I would like to see you for [BOOKING LENGTH] at [TIME OF BOOKING] on [PREFERRED DATE] in [YOUR CITY]. Thank you