I am looking for a train departing from london kings cross 
Sure.  Where are you going?
I would like to go to Cambridge, after 11:15
Okay, and what day do you want to make the trip? 
I want to leave on Monday.
Great, TR5720 from london kings cross to cambridge leaves monday at 11:17. Can I book this for you?
Actually, can I have the price, and the travel time please?
The cost is 23.60 pounds and the trip will take 51 minutes.
Great that's all the info I need, thank you for your help today.
Thank you very much. Have a nice day.