Sticking to a schedule for your business when you are starting out.

I am working on getting my first paying coaching client. I think it’s a good idea to create a daily schedule when I will see clients based on what works with my schedule. Right now I am committed to only taking clients Monday through Friday from 9am to 3pm. Those hours work for me. But what if I get someone that wants to work with me outside of those hours? Since I’m needing paying clients should I make exceptions in the beginning until I get more paying clients?