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Since the content of what an NPC says will depend on the state of the world when they are encountered and the actions of the PCs, an adventure can't provide the full text of what they will say.

In any given session, the player characters might encounter a number of different Non-Player Characters (NPCs). The game master's goal is to differentiate them from each other in the minds of the players. Besides their visual descriptions, NPCs are defined by what they do or don't do, and what they say and how they say it.

But what an NPC says at any given time might depend on a number of different variables, making it impossible to enumerate all possibilities on the page.

An information-dense way to still increase Usability at the Table is to provide one or at most a few quotes an NPC might say in general. This can quickly communicate a certain tone the NPC might have when speaking, and provides a fallback for when the game master needs a quick, ready-made thing to put into the NPC's mouth". This will often be enough to get a small conversation about the real topic at hand going.

Therefore:

When providing NPC descriptions, add one to three quotes that the character might say. Make them as specific to the character as possible, both in tone and content.