I am trying to book a trip union passenger terminal in New Orleans la to Nashville th an can find nothing online to book a trip where can I go ?

I always call Amtrak and speak to an agent.

Both www greyhound com (busses) and ww.amtrak.com (train) would be a good place to start.

Did you type in Amtrak New Orleans to Nashville, you should see some websites offering tickets. If you still don't see it, you may have to call or go to Union station

Google AmTrak New Orleans to Nashville, or flights- New Orleans to Nashville.