Which trains arrive in Cambridge by 17:15?
There are many at that time,can I get a departure site?
Yes I need it to depart from  norwich.
I have a train that arrives in cambridge at 16:35.  Will that work for you?
Yes, what is the ID and price, please? 
The train ID is TR9266. Is there anything else?
And what is the price and departure time?
The price is 17.60 pounds. The departure time is 15:16. Would you like to book it?
Yes please book it for me.
How many tickets do you need to book?