Hi I'm looking for a train departing from Cambridge that leaves after 17:15. 
What is your destination?
I will be going to bishops stortford.
I would recommend TR1567 which leaves Cambridge at 17:29 and arrives at Bishops Stortford at 18:07. 
No, can you find another one please?
The next one after that departs two hours later. Would you like to reserve a seat on either train?
Yes, either train would be fine.
I have booked your seat on the TR1567. Total fee is 10.1 GBP payable at the station. Reference number isCWX49ENL
Thank you. Could you also recommend a college in the Centre to visit and provide the post code?
Christ's College would be great, their postcode is cb23bu. Is that all you need?
thank you that will be all good bye
Have a nice day!