I may miss a flight later today due to circumstances not caused by delta. Just may not get to the airport in time. I've never done this before. What's delta do for rebooking? Treat it like any other change request (would be $1k+) or make some sort of accommodation? Any magic phrases that help direct the conversation positively?

Flight is out of lax, 2nd last flight of the night and sdc to the later flight was already declined by phone agent.

eta: updated thread title