Hello, I'm trying to take a train on Wednesday that leaves from Broxbourne. Can you help me book a ticket? 
Sure I can help you with that. I have train TR0788 leaving at 05:32 and will arrive to cambridge at 06:32.
I really need one that leaves after 11:00.
I have 13, is there a time youd like to arrive by?
It doesn't matter, as long as I can book it for 6 people. I will need the reference number please.
Success! TR5953 departs at 11:32 and arrives 12:32. Your reference number is EQCLFB3Q. 
Thanks, I'm also looking for an expensive restaurant.
Sure, which part of town are you interested in eating at?
I'd like to eat in the city centre, if possible. Got any reco on Chinese places?
We have four: HK Fusion, Sesame Restaurant and Bar, Ugly Duckling, and Tang Chinese.
Pick one for me. Book it for the same group of people at 18:45 on the same day.
I am sorry but I was unable to book you at any of those restaurants.  Would you like to try another time?
Are any of those expensive? 
They are all expensive. Would you like to try an early time?
Try it for 18:45 on the same day Wednesday, and please give me the reference number. It will be for 6 people.
I have booked a reservation at HK Fusion. Your reference number is XO4S9CL7. Do you need anything else?
That should be it. Thanks for your help!
You are quite welcome!