Lesson 17, Exercise 8:
Voluble, loquacious, talkative, and chatty are synonyms

The main meaning of the verb 'chat' is to talk. The adjective 'chatty' is based on the verb!
Voluble is a less common word than talkative for talking a lot, which is what we see here: lots and lots of talking by both people in conversations.

Voluble people are always talking.
Tap on any word once (mobile), or double-click on any word (computer), to read an English definition. If you need an approximate translation to your own language, the Google Translate button is available at the top of the screen.