AI Chatbot - sales outreach / Cold Calling Sales Agent Development

I need to build a sales ai outreach bot. I have started to use Retellai.com. I can’t seem to get the agent to engage in a two way conversation.

dedicated sales agent to focus on cold calling.

Key Responsibilities:
- Cold calling medium enterprise
- Generating leads and setting appointments
- needs to be able to navigate past a gatekeeper
- natural conversation
- goal is to outbound into business and then look to speak with a key decision maker and then book discovery or demo call for a field sales person