Flat out asking to ride one, yes. Being offered a ride by one ordered by the Lord to take you up there, no.
Of course like all beings, some dragons are more open to it than others. There are dragonriders around, while some other dragons just relax in maid cafes.
... yeah Lee is one of a kind (or it is quite a strange world...)
To Kolth/Senhime "Do you have any means of transport we could take to meet the princess sooner, or should we just get ready and resume the long trip tomorrow?"
“No matter how subtle the wizard, a knife between the shoulder blades will seriously cramp his style.”
― Steven Brust
“Plan. Yes. Good idea. I should come up with a plan.”
― Steven Brust, Dzur