ASP.NET Multi-Step Booking Widget Development

I run the appointment system at http://qwicbook.com and I need to give our doctors a smoother way to embed it on their own sites. The goal is a self-contained booking widget that loads through an IFRAME, walks the patient through a clear multi-step flow, and talks to our existing ASP.NET back-end... (Budget: ₹12500 - ₹37500 INR, Jobs: .NET, API Development, ASP.NET, C# Programming, Frontend Development, HTML, Web Development)