Question

How does make A.I based system ?

Answer 1

U may try it
This post is one of a series of articles aimed to help you get a simple personal assistant running with Api.ai:
1
How to Build Your Own AI Assistant Using Api.ai (this one!)
2
Customizing Your Api.ai Assistant with Intent and Context
3
Empowering Your Api.ai Assistant with Entities
4
How to Connect Your Api.ai Assistant to the IoT