AI Agent entry point orchestrator agent implementation advice

Our customer requested building a unified entry point for all available AI Agents. So that user does not need to trigger each agent to ask questions within the covered topics. He wants to have a chat window where user can post queries and an orchestrator agent on the background will trigger the right agent to answer this question, so that user can receive answers accordingly.

Can you recommend which approach will serve best for this purpose? I appreciate if you share examples of similar implementation based on real experience.