Alluuvia
On first sighting the lifeforms, which looked large and alien and very dangerous, Lyla's first thought was to call the mission complete and take off again and continue the survey from the very safe distance of high orbit. But she waited, as she also caught sight of the hands and weapons that suggested intelligence, if not peacefulness. But if weird-looking aliens landed on her world unannounced, she'd come armed too. 'Yeah, let's hope they're friendly too.'
Not sure what might or might not be considered an aggressive gesture in their culture, Lyla settled for simply raising her hand. She called out in Basic 'Hello! We come in peace.' It sounded like a cliche from a holo-vid movie, but it was the best she could come up with on short notice for a potential first contact. She hoped they knew Basic, and if not, she tried Ryl, Rodian, and Huttese next.