I need help finding train to Lodon Liverpool Street.
Thank you, I see there are several to choose from.
I need it to arrive by 19:45 on Sunday and I'm leaving from Cambridge. 
Train TR1163 leaves at 05:59, is that okay?
Yes, I'd like to book it for 3 people. Could I get the reference number as well?
Booking was successful, the total fee is 39.83 GBP payable at the station. Your reference number is 121NE14K. Can I help with anything else today?
Can you find me an expensive restaurant in the centre, please?
There are 33 results.  Can we narrow down by type of food?
I would like a restaurant that serves venetian food, please.
There are no expensive venetian restaurants in the city centre. Is there another food type you want?
Sure, how about some British food?
There are 3: Fitzbillies Restaurant, the Cambridge Chop House, and Midsummer House Restaurant. Do any of these sound good to you?
Are all three of these expensive restaurants? If so I'd like to try the Midsummer House Restaurant. May I get their address please?
Yes Midsummer House Restaurant is expensive, it's located at Midsummer Common.  Would you like me to help you make a booking?
That was all the information I needed, thank you!
Thank you for using our system!