Hello.  I need a train leaving from London Kings Cross on Thursday.  What's available?
I have multiple trains leaving London Kings Cross Thursday.  What time are you looking to leave by?
I am looking to go to cambridge and arrive by 9:45
I have 2 trains leaving London Kings Cross for Cambridge Thursday arriving before 9:45.  Which would you prefer, one arrives at 6:08 the other 8:08?
What's the price?
The price per ticket is 23.60 pounds and the ride is 51 minutes long. Can I help you in booking a ticket?
No, no booking is necessary. But thanks for the info. Thats all I needed. 
Very good. Have a good day.