I imagine you’d start with a screen of questions in a list.
When the user selects a question, it links to an answer (using relations columns)
On the Answers screen, using the you could then display both the question and the answer.
Underneath display the list of questions again.
This would be stage one and probably fairly easy to do I think.
Stage two, you could investigate building up the list of questions and answers so it looked like a conversation. This would require writing back to a sheet. 
You could also provide similar questions and answers as a type of pre-emptive, which could also be done with the relations column probably.
Thus, saying you want to buy coffee would also show answers for how much it’ll cost and where from.
Your biggest challenge is actually styling it to look and feel conversational, as Glide gives very little control or flexibility over styling. 
That will definitely need some spreadsheet magic using html and the Rich Text field.
Also, you might be able to use shields.io that @ionamol uses in Learn Drops (How to use "SWITCH" to change data per user)