Someone asked that NA put up a page with NPC voice commands. It would probably fit well on NexFiles.
I found and added to an old post forum post of mine in the meantime:
Almost all NPCs will respond to everything on this list. Though, with things like repair, most of them will respond "That is an ability I don't possess"
Many responses can only be heard by you. If you have any trouble, watch your punctuation and capitalization.
You can also shout to have them hear you from further away. Put "/s <sentence>" in a macro to shout from your say macro.
What's your name?
What have I deposited?
How many <item> have I deposited?
How many Coins have I deposited?
I will deposit <number> coins
Give my <number> coins back
I will deposit <item>
I will deposit <item> number <number>
I will deposit all <item>
Give my <item> back
Give my <item> number <number> back
Give my all <item> back
What do you buy?
Buy my <item>
Buy my <item> number <number>
What do you sell?
I buy <item>
I buy <item> number <number>
Do you have <item> (They respond but always tell you they don't have it )
How much is <item>
Then there's some things that work with only certain NPCs like:
Some respond to Hello or Hi
Ox and his counterparts will respond to Buya, Kugnae, Nagnang, and Tangun.
The Sanhae smith responds to "Coal".
I can't remember what it was, but there was a short word Walsuk responds to...not that it does anything.
Work continues on the continuation of the Story