How to create an Error-Free Booking Chatbot?

Hi everyone,

I’d like some advice on the project I’m describing below.

For the past weeks, I’ve been building a WhatsApp chatbot demo in n8n to handle appointments and answer FAQs for a medical clinic. I’m using Google Sheets and Google Calendar.

I don’t have much experience building this kind of thing in n8n, and I’ve noticed that the AI model (Gemini) makes several errors in its responses. It mixes up dates and times, and sometimes claims there are no free slots when there actually are. I know this is part of the troubleshooting and fine-tuning process, but I already have a fairly extensive System Message with many rules designed to prevent these errors, and it keeps making them.

So, my question is: for a WhatsApp chatbot, is it better to use fixed options (like a menu) to avoid these errors, rather than having the AI respond with free-form text?

My goal is really to give customers the feeling that they’re talking to a person, not a robot. However, if the AI is prone to so many errors, I’m wondering if it would be better to use buttons, fixed menus, or a hybrid approach?m

What do you recommend?

Thanks in advance.

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How to create an Error-Free Booking Chatbot?