My daughter did that same trip out of New Orleans, only on the competitor. Unfortunately NO OTHER LINE was running ships out of that port during late summer last year. We loved the entire experience crusing out of New Orleans after spending time getting to know the area. Check out my videos and see if you shared any of our experiences.
https://www.youtube.com/watch?v=4b7VSZOlei4&t=218s
https://www.youtube.com/watch?v=GrMPuWhoQhI