They are in a hired wagon with a driver. Previously, at least, Alma and Luna were traveling together with others who were merchants. After the deceit at the city wall checkpoint, I figured that they were speaking pretty quietly about how Alma wasn't actually Luna's brother. But in this present travel with Raul added, they are not being discreet at all.
I don't think that there are other passengers, but Alma is using magic pretty openly with the driver present. That bugs me a bit.