So I'm making a mod and everything is going OK so far but I have run into a problem and I need help.

1. How do I make certain speech options only available to some people. My NPC is going to ask who the player is and I want there to be a list like

"I'm the listener for the dark brotherhood"

"I'm The arch mage of the collage of winterhold"

"I am thief for the thieves guild"

"I am dragonborn"

"I am the harbinger for the companions"

"I am a bard"

How would I do this. I only want them to come up when you are actually with the above. PLEASE HELP!!