In the previously used example we can add the first example of a relational dependency to hardcode the beginning and end the flight.
Intent: Book Flight
Original utterance: "I'd like to fly from New York to Los Angeles"
Utterance with entity: "I'd like to fly from [Start:City] to [End:City]"
User input: "I'd like to fly from New York to Los Angeles"
Recognised Entities:
Starting entity: New York
Ending entity: Los Angeles