Being able to have conditional responses

[Greyhelm]

I looked aorund and either I am not seeing it or I just am searching wrong.. I was looking to see how about doing a conditional reponse for quest characters that have more than one turn-in. Example;


Character X: Hail toon
Toon Response: I am looking for a [code], can you find one?
Character X: a code
Toon Response: Yes silly text to have something do something for you.
Character X: Gives Toon code.
Character X: Hail toon.
Toon response: Now that I have the code, script this.

Character Y: Hail toon.
Ton response: I am looking for a [code], can you find one?

I am guessing it will have to do with flagging the character for the turn in. But ultimately I want to have the dialogue progress as things are turned in and not repeat. Can I get pointed to where I need ot be. I was reading through the PoP flagging but I am still new to scripting. Thanks in advance!