Can you find me an italian restaurant that is in the centre?
You have your choice of Pizza Hut City Centre, Stazione Restaurant and coffee bar, Pizza Express, Ask, or Zizzi Cambridge.
Are any of them in the cheap price range?
Pizza hut, ask and Zizzi all appear to be in the cheap price range,   Would you like me to book one?
Which one would you recommend?
I recommend Ask. Do you want me to book it for you? What day and time do you want to eat?
As long as it's in the same area and price range, I guess I can try it. Please book it for 6 people at 17:15 on wednesday. 
I'm sorry, a table was not available. Would you like to try another restaurant?
Another, same area and price range please. 
zizi cambridge is available. It is also a cheap Italian restaurant in the centre. Your reservation is for Wednesday at 17:15 for 6 people. Your reference number is CRW6R09Z. 
Great thank you for your help that's all I needed today.
Have a great day!