Dust!? She must have been at Em's store then clearly. Well, she can teach a thing or two about that.
"Dust is a bit more than just that... You got a Semblence? No can't be with how new you are, and I doubt you're from Remnant anyways you don't know what Dust is."
She'd reach onto her back and pull out her own weapon, a blade, in a large sheath that has a bladed edge on it. After a moment said blade would quickly fold itself up to reveal a small machine pistol in her hand. Along with a long cord on it, wrapped around her right hand.
"Not so different from mine, though yours is no chain scythe to be sure. Anyway, yeah Dust has various elements on it... Not so easily used as melee weapons though, they're more like bullets. And with training they can be mixed into a Semblance sometimes, but we won't focus on that. Instead, I'll try to teach you some basics about dodging and swordplay, quickly shifting forms with that weapon, and of course aiming straight."
The very basics, Niko clearly needs to start from the ground up and there's no avoiding that...
"Anyway, I guess you should meet me somewhere later right? Got one of those phone things? I can toss you a number if so."