Basic template that can output images and Excel files as well as text.

Looking for a basic template to get started that can output images and Excel files as well as text. It's a simple OpenAI Assistant that reads a curated selection of PDF files that have investment statistics and users can ask questions about the statistics and generate images of charts and graphs and export Excel files. Works well in the OpenAI playround but I would like to use VoiceFlow as the front end. Any pointers to an appropriate tutorial or template that handles image and excel output appreciated. Thanks. John.