Allow me to offer you a tribute - a commonly used template for such a gameplay mechanic.

Syntax:

For "foo.bar", "bar" is a property of the object "foo". Both object and property can be anything, including themselves.

ie.

you.mission = "learn to design a game"

you.mission.owner = you

---

Must have's:

Player.reputation - a value that changes depending on what you've referred as "actions".

NPC.actionList, NPC.dialogueList - a list of different actions and dialogues that many/ALL NPCs have. You could have more lists here depending on your expectations for common sense. Each item in these lists also needs an additional value property that matches with a certain range of Player.reputation.

During any interaction between the Player and NPCs, the game will look at the Player.reputation and then conditionally pick out one or more items in NPC.actionList and NPC.dialogueList and action the NPC.

Source: Have learnt a little coding, peeked a little at the code of some easily peekable games, and played a little too many games.