How to make AI Agent ask the user a question?

Hello, I want to use my AI Agent for lead generation. Agent has to ask the user for their name, phone number and email address in a separate questions.

I tried adding instructions like "Ask the user for their name, phone number and email address." into the Agent instructions field on the Agent Details page. It didn't help: when I test it, agent is not asking any questions.

I also tried adding instructions as a pdf into knowledge source but it didn't have any effect.

Can you please suggest how can I make the bot ask user questions?