If I change my rates, is there a way repeat clients can still get the original rate they booked with me while all new clients use the new rate?

I just started on Rover and set my rates a bit lower because I want to build up my clients. I just realized though, I will eventually raise my rates as I get more experience on Rover. For repeat clients, I don't want them to have to pay the new rate, they should get the rate they have always had. Is there an option for this?