Set a default staff member for a service with multiple staff available

I have a booking page which allows users to select any of 3-4 staff members which are available. I want to keep it so any of these staff members can be booked as any particular one may be busy at a given time. However, it make sense in my case for a specific staff member to be the default choice for a particular service.

So my question is, is it possible to have a specific staff member be the default choice for a service without removing or restricting the ability of users to book a different staff member if they choose to or if that default person is unavailable