In my game, you start off in a room next to a sentry (on the same team as you) and then a popup goes up at the bottom saying basically saying come over to me to talk. When you approach it, you step on a trigger. The trigger connects to multiple checkers.
When you run out of space, or come to a pause, you end the popup. Link it to the next, saying “when popup closed, open popup”. You then make it so that at the end, it adds 1 to your progress.
I used a checker to increment the counter, as I learned in @NavyCatZ “how to make scores in capture the flag”
You then have tasks or other things add progress, to make it so that you can only have specific conversations at specific times. And there you go! Dialogue!
Great job! I suggest you add screenshots and looking over your grammar (multiple, dialogue, etc.). Also, this has been already made (in a different and simpler way), so I suggest crediting this guide.