I need a train to cambridge on saturday
Okay, where are you leaving from?
I need to leave London Liverpool Street sometime after 17:45.
I have three options for you, is there a particular time you would like to arrive by?
No. I need to book this for 5 people. Please send me the reference number too. 
I have you booked on TR3940 Saturday leaving at 19:39 and arriving at 21:07.  The reference number is X56OZZGL and it will be 13.28 GBP at the station.
Great.  I also need a cheap 4-star hotel.  
Do you have an area preference? Otherwise, I recommend leverton house on newmarket road.
Is it a guesthouse?
It is a guesthouse in the east. Would you like me to make you a reservation?
No thanks. No need to make a reservation but can I get the postcode please? 
The postcode for Leverton House is cb58rs.  Is there anything more I can help with today?
No I think that's all I needed, thanks!
It was a pleasure serving you today. I hope you enjoy your stay!