Is it possible to refresh when client changes between services?

When clients make an appointment with Appointment+, they can choose between a lot of services. Let say the client chooses at first a service of 40 minutes, but changes his mind and chooses a service of 20 minutes. When they don't click again at the button See available times, the service will still be the 40 minutes service.

Is it possible to let the calander refresh automatic? So when the client changes between services they don't need to click the button of available times again?