Hi, I am experimenting with vapi.ai. My goal is to create an outbound call agent to confirm an appointment, with integration with make.com. How can I manage the response of the person I am calling? I would like to store the response in a Boolean variable that I can then access in make.com. Should I use vapi.ai's tools for this, or should I have the transcript evaluated by ChatGPT in make.com? Thank you!