Greetings, I need a train leaving on Saturday after 19:45.
There is a train leaving out of cambridge on saturday at 21:00 for 18.88 punds. 
Is it going to broxbourne?  That is where I am heading.
Actually yes! TR5975 leaves from broxbourne at 21:01. It's 14.32 pounds. Does that work?
Yes, that works just fine, can you please book me a reservation?
Of course, how many tickets would you like me to book?
Just one, please. I'm also looking for colleges in the centre of town.
Your train has been booked with ref. num. WIDHBP94. Sure, information on colleges: There are 13 in the central district; do you want one with free entry? Religious or secular?
I just am looking for one in the centre, can I get the phone number of one?
Yes. Downing college is free and the phone number is 01223334860.
Ok, thank you, that will be all I need for now.
You are very welcome. Have a safe trip!