I need to find a train going to cambridge from london kings cross. 
There are 70 trains meeting those requirements. What day of the week are you leaving?
I need to leave on Saturday and arrive by 17:00.
I have a train that fits your criteria Saturday, it leaves at 05:17 and arrives at 06:08. Would you like me to book it for you?
No, I need to arrive by 5:00 no 6:00 can you check the schedule again?
I have a train that arrives at 16:08. Is that what you are looking for?
I need to arrive in Cambridge by 17:00. 
Booking was successful, the total fee is 18.88 GBP payable at the station .
Reference number is : 8602X6OE.
Thank you for your help
Is there anything else I can help you with?
No thank you.
OK. Sorry for the confusion about the times. If you need help with anything else just let us know.