Hopefully you can help me with my planning.  I am looking for a place to stay and have no idea what to choose.
Do you have any special requests?
it should be a three star  and internet is not a must
I found a guesthouse in the north area that's 3 stars at 63 milton road. Would you like to book a room here?
I was hoping to book a hotel if one is available.
When would you like to make a booking for?
Actually, I'm going to hold off on booking for now, but can I get the postcode? 
post code is cb41xa, anything else today?
I also need a train leaving Cambridge after 18:15
What is your destination?
I'm going to Broxbourne on Sunday.
What time could you like to arrive by?
7:00 am Can you book it for me and get a reference number ?

Just to clarify, at first you said leaving after 18:15, but that said arriving before 7, before I book, can we confirm the time once more?
Can leave anytime after 18:15.
Great TR 8991leaves at 19:01 and is a one hour trip, does that work for you?
Yes, that will work. Can you tell me what the arrival time is? 
The arrival time is 20:21.
thank you that will be all. 
Enjoy your trip.