Looking for Recommendations for chatbot

I have been tasked with developing a chatbot to retrieve relevant information from an excel spreadsheet based on a users query.

At the moment I have built it using Botpress, and it’s pretty straightforward.

However, I am looking for a better option that would allow me to:

1. Do more relevant search and retrieval
2. Give a Rationale as to why a specific resource is picked
3. Ask for more questions if the initial user query isn’t straightforward
4. Browse the web for Canada Specific resources if no resources are found.

What platform should I use to achieve all these in a Less complex way.

Thank you in advance