I need a train to stansted airport that leaves after 21:30. I am also going to be looking for local places to eat.
There are several departures to Stansted Airport with one every hour beginning at 22:08.  Would you like for me to look up a local restaurant for you?
I will take a seat on the 22:08 departure as long as it departs from Cambridge on Friday.  Yes, please find a restaurant.
How many tickets shall I book for you on the 22:08 train on Friday from Cambridge to Stansted Airport?
5 people for the train please. 
Great I have booked your tickets for 5 people leaving at 21:40 and arriving at 22:08. Is there anything else I can help you with?
Yes I am also looking for a restaurant in the centre of town in the expensive price range.
The fitzbillies restaurant is in the town center and it meets what you are looking for.  Would you like for me to make you a reservation?
Perfect, can you book it for 5 people on the same day at 16:30?
Sorry, but they're all full at that time. Would you like to try a different time or perhaps another day?
Can we try for 15:30? I also need the reference number for the train booking.
Your reference number for the train is KVNAC7LA. I was able to book Fitzbillies for you at 15:30. Your reference number for the restaurant is UN2K2CD8. Is there anything else?
That's all, thank you.
Are you certain you don't need further assistance?
Yes, I'm sure. Thanks.
Have a great trip!