Help needed for a dialogue/speech System

Im making a 2d sidescroller for Android.I want to make a dialoge system that when you click a gameobject or go near it. It comes up with text and buttons with text on them that when clicked would come up with more text. i use uscript but i can do with answers in any language. Thanks soo much!!! ive spent weeks getting no where.

If you want to create an NPC talk system, you should start by watching this tutorial.
It will get you started on making your own system for talking AI. Then you can modify the code to fit your own game better.
Hope it helps!