I would like to book a train out of Cambridge, please.
I'd by happy to help. Where would you like to arrive?
I want to go to london liverpool street.
On what day and time will you be traveling?
Tuesday leaving sometime after 18:45.
Ok, TR 3515 leaves on Tuesday at 19:59. Would you like to book it?
Yes, that sounds great.  
How many seats will you need for this trip?
Actually, I can book it separately. But I will need help booking a hotel -- the Lovell Lodge
I can help with that! How many people will be staying, for how long, and which day would you like to arrive?
Thank you! For 3 people, and 3 nights, starting Saturday, please.
I was able to book it, reference number is R72D5LVK.
Thank you for the help, thats all I need today.
You're very welcome. Have a nice day.
Thank you I really don't need anything else. 
Call back with any questions any time. Goodbye.