Build a custom voice agent from scratch — and change its rules by chat

Start from a blank agent and build a yacht-charter booking line just by describing it in plain English — no template, no code. Then change the agent's rules mid-build: never quote an exact price, always ask about catering. Hear the new rules hold on a live call — when the caller pushes for a price, the agent gives a range and offers to send a written quote instead of a number.