I'm looking for a train to cambridge on Saturday.
Where would you be departing from? 
I will be departing from Ely. 
Could you leave on Friday?  There are no trains available on Saturday from Ely to Cambridge.
Sorry, I misspoke. I am actually departing from Broxbourne. 
There are about 19 trains available. I can narrow that down some if you tell me if you want to leave or arrive by a certain time. 
I would like to arrive by 15:30.
There are 9 trains that meet your criteria that day, one leaving every hour from 05:32. Do you have a departure time preference?
No, we just want to get there either at or right before 15:30, please. Can you get me 8 tickets on the closest train to that time?
8 tickets for the TR7846 leaving at 09:32 your reference number is D0CG7JD3. Anything else today?
I'm sorry, I meant that I need 5 ticket for the train booked. Can you fix this? 
Yes sure. I booked that for you for 5 people and the reference number is  IFXPNYHS.
Now that the train is settled, I need a place to stay that is in the expensive range with free parking, please.
There are a number of expensive hotels in town. Do you have a preference for area you'd like to stay?
I would prefer a guesthouse if possible.
I do not have any expensive guesthouses. Can I try something else?
Can you try moderately priced?
I suggest acorn guest house it is in 154 chesterton road.
Ok, that sounds great. Can you book that for me for 3 nights?
Yes. I need to know what night you'd like your reservation to begin and how many people it will be for.
For 5 people starting on Saturday.
I have made those reservations and your reference number is S4MONUEY.
Thank you so much. That's all for today. 
You're welcome. Have a great day.