Raspberry Pi Project

Hey there I am trying to do a Raspberry Pi project which runs a script at startup. I need the script to play a looped video. During the looped video section I would like it to play randomized videos, at different intervals. Then using voice commands runs different videos depending on what is said. Once those voice command videos have finished I would like it to return to the looped video. I would also like to be able to use the voice commands to start up games/emulators of old gaming consoles.. I would like the script to respond to voice input, for instance; It would ask, "how are you going?" if the reply is " I'm good" it should be able to pick up the word good, and play the associated video. This robot won't be connected to the internet so a voice command system that doesn't require the internet would be great! This is a tricky project and could require a bit of time.. I know there are a few ways of going about this, and I would like to know how you would do it. So when bidding on this project, please let me know your experience with the RPi and how you would go about coding it. I know a little bit about the coding side of things but not enough to make this project happen. Please let me know your thoughts and and I will choose the bidder based on knowledge and realness.