If I were building a customer facing AI agent that worked at...

Prompt

If I were building a customer facing AI agent that worked at the host stand in a restaurant, what are the things I would need to consider to make my agent the least problematic for guests, taking into account the normal places that AI agents trip up. Even if I wrote a bullet proof system prompt, what are the things I would need to look out for? What areas are agents still weak when it comes to customer service?