SaaS for doctors: There's need, why aren't competitor products being used yet?

Hi there,
I'm currently working on a SaaS solution for doctors and medical practices to automate calendar scheduling.
Here's how it works:

1. Doctors enter a list of services that they offer into my software. They provide a short description and the time they expect it to take them.
2. Doctors offer "Book Appointment Now" button on their website, redirecting to my web application.
3. Patient can select of the list of services offered by the doctor or select custom.
4. Free times are...

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