Hello. I need help planning a train trip.
I'd be happy to help. Are you departing from a specific station, or do you have a specific destination in mind?
I'd like to leave from London and travel to Cambridge on Saturday around 15:00
Would you like to depart from London Kings Cross or London Liverpool Street?
I would like to depart from Cambridge.
Please state your departure location and your destination. Also, is 15:00 the time you want to leave or to arrive? 
I am leaving from cambridge going to broxbourne and want to arrive by 8:30.
How about TR8674? It leaves at 05:01.
As long as it arrives by 8:30 that sounds good. I'll need 7 seats please.
It does and I have booked 7 seats for you.  Anything else?
Reference number please?
Sure, the reference number is VATL0RJL. Is there anything else I can help you with?
That is all, thank you.
You are welcome. Thank you for TownInfo centre for your traveling needs. Goodbye.