I am looking for a train from cambridge
Certainly, where is your destination? 
My destination is norwich.
There are 133 trains do you have a day and time you'd like to travel?
I need to leave Saturday after 17:00.
I have one leaving Cambridge at 17:36 and arriving in Norwich at 18:55. Would you like to book it?
What is the train id and price?
The train ID is TR4018 and the cost of the journey will be 14.08 pounds.
That's everything I needed to know thanks.
You're welcome. Have a great day!