Build me a simple Twilio call flow that checks my google calendar before forwarding

Hi guys I'd like someone to help me create a simple call flow using maximum three tools: 1. Zapier 2. Twilio 3. GSuite The flow is pretty simple: 1. When someone dials my Twilio number 2. Twilio is to check my GCal free/busy status 3. If busy divert to a Twilio voicemail 4. If not send the call through to the designated number. I'm somewhat familiar with Twilio studio and can do basic things but will need help to create the script to interrogate the free/busy and make a decision. Ideally, that logic should be self contained so that I can occasionally move the terminating number or add additional logic later. Thank you.