Zoho Booking API to update service for Assigned Agent

Zoho Booking API to update service for Assigned Agent

Hi there, 

I have been testing and looking at the Zoho booking API for the Assigned Agent update from Zoho CRM for a long time. There is only a Fetch service request, but no updated Assigned Agent options. Does anyone know how to do that?

PS: I can use reschedule appointment request, but that is just for some ongoing/coming appointment agents. I would like to change all the Assigned Agents under Workspace.

Thanks!