Hi. I need a train out of cambridge.
There are several trains out of Cambridge but i need to know your destination and preferred day and time of departure.
My destination is birmingham new street and I need to leave after 9:00.
On what day will you be travelling?
I will be leaving on Thursday. 
I have a train leaving at 9:01 on thursday. Would you like to book that?
Yes please book that for 1 person.
Booking was successful, the total fee is 75.09 GBP payable at the station. Your reference number is ZYKE5A4L. Do you need anything else?