Start the conversation.
Write to doug@wonderlustexpress.com and tell us who's traveling, roughly when, and where your thinking is, even if it's early. A sentence is enough to begin. If you already know what the trip is for, say that too: it is the part everything else gets built around.
Doug reads every inquiry personally and replies within a day. The first reply is a real one and not a form: a few questions back, and an honest word on whether this is the right house for the trip you have in mind. If it is not, he will say so.
Nothing is owed for asking. No fee is quoted until we both know the shape of the trip, and nothing is booked until you have seen the plan and said yes.
If writing feels slow, this line reaches Doug directly.