I'm actually in need of a train leaving Thursday after 16:00 from Cambridge to London Kings Cross. Can you find me one? Certainly, the earliest train by your specifications is TR1791, leaving at 17:00 and arriving at 17:51. Would you like to book that train? Great. Can you please give me the travel time and price? Yes, the travel time is 51 minutes, and the price is 23.60 pounds. Thank you! That's all I needed. Your very welcome! Have a nice day!