I'm not going to go into the interaction here but the basics of what she wanted were the objects: Table and Guest, the metadata that would be stored in each and the basic subsystems to manage them. She also had me lay out the basic processes involved including reserving a table. There was a disagreement as to whether the system assigns guests to tables or the service staff; while in every version of this system I've ever seen the system just knows capacities and sitting times she wanted the system to manage the whole restaurant.