Always having the right thing to say

When talking with NPCs you can include many keywords in the same phrase and get different effects.

Putting the phrase in a hotkey allows you to cover all sorts of situations.
Example: hi trade passage balance mission yes
If said to a banker twice will get your balance
If said three times to a travel NPC that only goes to one location, it will bring you there.
If said to a trader twice, it will open the trade window.
Note that the NPC will not hear the yes at the end if any other words are valid.
Example: hi bye trade passage
Saying this, they will never hear trade because bye is first and you can always say bye to an NPC

This is useful for quests when you creatively come up with possible things to say to continue or even start a mission.

Other common keywords you might want to say are:

deposit all