Yes I am looking for an expensive place to eat that is located in the city center.
There are quite a few restaurants in the center.  What kind of cuisine are you interested in?
Hmm. I feel like discovering something new. Which restaurant would you recommend?
I would recommend Papadoux they are very expensive and right in the center of town
That sounds great. Could you book a table for one at 11:15 on Friday?
I'm sorry, Papadoux is not coming up. There is an expensive African restaurant called Bedouin in city centre. Would you like me to try that one instead?
Yes, or any in the same expensive range and the centre area. 
I apologize the Bedouin does not have any open seats for that day and time.  Would you like me to try another restaurant?
Yes one in the same area and price range please.
Okay I was able to book you into the Kymmoy, an expensive Asian restaurant in the center of town and your reference number is YCQWEGOS.
Great! Thank you so much for your help.
You're very welcome. Is there anything else I can help you with today?
No thank you for all your help.
So happy we could be of service today. Enjoy your time in Cambridge!