I am looking for a train.
I'd be happy to help you with that. Can you tell me your departure location and where you are headed to?
I am looking to go to london kings cross and depart from cambridge.
There are 70 trains making that trip, do you have a day or time?
I'll be leaving on friday after 12:45.
The TR3685 leaves just 15 minutes later, at 13:00.
That sounds great.  I'll get back to you when I decide on the booking.  Have a nice day.  Bye.
You're welcome! Have a great day. Goodbye.