Show full chatbot discussion?

I am designing a guiding chatbot that shows you around in a virtual tour and helps you make a decision about buying that property. Now as it is a moving bot which also shows and points out on the screen, it shows its message from its chat head (screenshot below) and you can answer by typing or clicking a suggested response at the bottom.

In my design, you can't scroll up and see previous messages. How important is it in this scenario to be able to see the complete chat history? If keeping chat history is important, where should I place it?