1 Paris: Triana traffic control, this is inbound free trader vessel Legacy, requesting landing clearance.
2 Triana traffic control: Roger, Legacy. What cargo are you carrying?
3 {beat}
4 Paris: Serron, what are we carrying?
4 Serron: Well, something harmless and legal, obviously.

I almost made the mistake of having Paris address "Triana spaceport". This would be a bit like flying a plane from Europe to the USA and then trying to talk to and land at "USA airport".

Instead, there's a global Triana space traffic control system, which directs traffic to and from the many spaceports around the planet.

I tried going back over the comics to determine what cargo they had loaded before leaving on this trip, but I couldn't find anything saying what Serron had acquired for their outbound trip from Bune. (I hope I didn't miss it somewhere - though if I did I'm sure some observant reader will find it. It's actually not that important for this strip.)