it's important to establish exactly what the customer wants before the flight and resource it accordingly
The purpose of an Introductory Flight is to allow an organisation to attract new members by giving a prospective new member a taste of the organisations activities. The person receiving the flight is not a customer as such and should have no expectations of being allowed to take control or to influence the content of the flight in any way.
The UK CAA has relinquished its duty of care detailed in GM1 ARO.OPS.300 to regulate such activity, wheras the DGAC in France has taken the matter seriously and laid down quite stringent requirements to ensure the safety of those carried.