How can I connect GHL calendar with VAPI to have VAPI book appointments on GHL?

Hi. Can someone please tell me which GHL endpoint / API call I would use to list all of the current appointments already in GHL for a particular contact? In my Make workflow, I have managed to create appointments successfully. But when it comes to wanting to either cancel or change an appointment, I don't know how to create a query to list what's already in the calendar for a particular contact. Which API query would you use for GHL? Thanks, Jules

Hi. Do you know if Retell has a built in function that parses today’s date and Timezone. I’ve used a function like that within VAPI. I think I saw a video where Brendan may have done this externally using a Make function. I’m sure everyone has experienced this little problem of the Retell Agent randomly making up its own date and time for the current time. It clearly needs a function to force the current date and time. Any guidance or suggestions on this would be greatly appreciated. Thanks in advance. Jules