I'm looking for a place to dine. The restaurant should be in the expensive price range and should be in the centre.
Do you have a preference on the type of food?
Yes.  I would like Greek food please.
I'm sorry there's no matches for greek food. 
Okay, can you search for british food instead then?
There are 3 restaurants that meet that criteria. May I suggest fitzbillies restaurant?
That sounds great. Could you book a table for 2 people at 15:45 on saturday.
Booking was successful. The table will be reserved for 15 minutes.  Reference number is : BSMDJMXH.  Can I be of further assistance?
Thank you that's all I need today. 
Okay, great. I'm glad I could help. Have a great day. Goodbye.