Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download UniSpeech Free.
UniSpeech v0.91
UniSpeech is a powerful visual editor for conversation trees and their visual representation inside your final game. Thanks to UniSpeech you can create complex conversations without the need for a single line of code.
Features:
– Play animations on participants.
– Play audio when dialog-step starts.
– Visual editors for conversation trees and graphical presets.
– Customizable graphical editor.
– No coding necessary.
– Simple demo scene included.
– Event System included: register to events when a dialog-step starts/ends.
The example conversation seen in the screenshots (containing tutorial videos for the visual editors) can be played here.