Hello Cheanguchu88
I think you simply purchased a train ticket from Lugano to Luzern for 2nd class at 64 CHF.
There is no dedicated Gotthard Panorama Express ticket. You simply need a 1st class ticket from Lugano to Luzern Bahnhofquai via Flüelen (See).

You can use your existent ticket; the conductor on the train can still change the routing and class. Or you double check / amend your ticket with the agent in the SBB Travel Center at Lugano before departure.
For the train you definitely need a 1st class ticket; for the boat you can use a 2nd class ticket, while 1st class is recommended.
Alternatively, travel to Locarno or Bellinzona and board the IR 26 or IR 46 train to Flüelen. This is a regular train service taking the same route as the Gotthard Panorama Express at no extra cost, yet without no tour guide or commentary.
Kind regards,
Roland