Is the chatbot implementation intended as a prototype or the final product? I think it keeps the barrier to entry low and it's got a bit of fun novelty value to it, but the value in your (great) idea comes entirely from the fact that it's quick and painless to use, and it could be 10x quicker and less painful with virtually any interface besides a chatbot.
Mobile keyboards suck, and nothing highlights that more than seeing a cool idea that could deliver a good value to me by simply asking me to tap one or two large-ish buttons once per day, but that I instead need to chat with.
Edit: I realize there's a large personal preference component to this as well. I personally would rather have a button or two to tap, but I do see how the chatbot-powered anthropomorphization could be a very effective motivator for people who like that.