I need a train on Tuesday that arrives by 16:45.
Certainly, where is your place of departure and arrival?
I want to depart from London and arrive in Cambridge.
london kings cross or london liverpool street?
london liverpool street. 
I have train TR1395 that leaves at 13:39 and will arrive in Cambridge by 15:07. Would that work for you? I would be happy to book your ticket. 
For two people please. I will need the reference number. I also want to stay at the Lensfield hotel.
Your train booking was successful. You can pay the fee of 33.2 at the station. Your reference number is 14AXWO0V. 
do you know the lensfield hotel? I need their phone # and how many stars do they currently have?
The lensfield is a 3 star hotel and the phone number is 01223355017. Would you like to make reservations there?
No thank you. That's all I need for now.
Ok. Enjoy your stay.