There are no post stations in the desert, but there are inns specifically for merchants and travelers to stay and resupply.
The inn is right by the road, and before their carriage even arrived, a servant warmly greeted them and apologetically said: "Gentlemen, there are only three superior rooms left in the inn."
Everyone: ...Well, that's really unfortunate.
Servant: "But within a hundred miles from here, there's only our inn."
Old Master You hurriedly asked: "I remember there is a small town past your inn."
Generally, small towns are situated on the edge of an oasis.
The servant grinned and said: "Yes, if you follow this road forward for over a hundred miles, there is an oasis."
So right now, the only option for resupply is their inn; it's the only business.
Everyone was helpless and could only choose to stay; Old Master You very cleverly said: "I'll squeeze in with the servants in the lower room, the adults can rest in the superior rooms first."
