comparing pdf with voiceflow

Hi, my name is Ken Lengel, and I am new to VoiceFlow. I am trying to create an AI agent with VF, that I can compare to pdf files. Saw that Voiceglow can do this, but they have little documentation to the effect. Any recommendations on how I can complete a compare of two pdf docs, and the compare would include a set of prompts to review the two docs? Thanks for you help all!