Mark spends the shuttle ride pondering exactly what he is going to say to Bel Thorne, over exactly what medium.

When they get there, he nips into a public comconsole booth and sends a text-only message to the Ariel:

Captain Thorne,

I will pay you fifty thousand Betan dollars for a one-way ride to Jackson's Whole, myself and one other passenger, departing immediately.

If interested, meet me in the public concourse of the orbital transfer station. I will recognize you.

There. The station's comm system will send it as soon as the Ariel appears within lightspeed shouting distance.