I'm looking for a place to dine.
Certainly. What type of food interests you?
I like ethnic food, particularly Indian food.
Great, I have a bunch of options for you. Do you have a certain area and price range you are looking for?
The restaurant should be in the expensive price range and should serve indian food.
There are 14 expensive Indian restaurants. Which area do you prefer? 
Area does not matter to me. Please Book it for 5 people at 19:30 on Wednesday. I also need the reference number.
I'm sorry, sir, I'm having trouble making that booking. Would you like to try for a different time or a different day?
Yes, Please book 5 people at 18:30. I also need the reference number.
Your booking was successful. The table will be reserved for 15 minutes. The reference number is XOT3L3NR.

Thank you, good bye!
Thank you and enjoy your stay in Cambridge!