I am looking for a place to stay. The hotel should be in the centre and should be in the cheap price range
There is not a cheap hotel in the centre area. Is there another area I can look for you?
The hotel should be in the type of hotel and should have a star of 4,
The cambridge belfry is 4 star hotel in the cheap price range in the west part of town. Do you want me to book this hotel?
I need to be in the centre. Is there a guesthouse available, if there are no hotels? 
The alexander bed and breakfast is a 4 star guesthouse, located at 56 saint barnabas road.
Great! I want to book it for 5 people and 3 nights starting from tuesday.
Booking was unsuccessful.  Do you want to try a different day?
how about thursday?
Booking was successful.
Reference number is : TFAJJNJF
Thanks, that's all I need. Goodbye.
You're welcome! Have a wonderful day. Bye now.