Task-oriented dialogue about: train

I am looking to book a train.
Certainly. May I ask where you want to depart from?
I would like to leave from the closest station to my location.
Could you tell me your location, which area of town or what business you are departing from?
We are leaving London Kings Cross and need to do so after 12:45 on Friday for 6 people and can I get the reference number for the booking?
To clarify, are you looking for a train to Cambridge? All Friday trains from London Kings Cross go to Cambridge.
I need to depart from London Kings Cross and go to Cambridge.
Booked! You leave at 13:17, your reference number is 3WICPFQP, you will pay 141.6 at the station.
Okay thank you. That is all I need.
Okay thank you for calling.