100% agree with devmik here.
Botpress is great and it looks like you can do it for free.
Botpress has a free plan which for you means that you get 100MB vector database storage which should just be enough for you. You also get a generous $5 in free AI credits which should be more than enough.
Botpress allows you to create a customizeable chatbot to fit your needs. If you want it to be able to have a higher correct response rate it is also possible.
All in all there isn't really anything as good for the price as Botpress right now + we have the best community for helping people.