Building a data model for booking flights

We have a graph that allows people to search flights. At this point, a logical extension to the problem statement could be to allow users to book flights online after they decide the route on which they wish to travel. We were only concerned with flights and the cities. However, we need to tweak the model to include users, bookings, dates, and capacity of the flight in order to make bookings. Most teams choose to use an RDBMS for sensitive data such as user information and bookings. Let's understand how we can translate a model from an RDBMS to a graph.

A flight booking generally has many moving parts. While it would be great to model all of the parts of a flight booking, a smaller subset would be more feasible, to demonstrate how to model data that is normally stored in a RDBMS.

A flight booking will contain information about the user who booked it along with the date of booking. It's not uncommon to change multiple flights to get from...