I am planning your trip in Cambridge. I need a train,The train should depart from birmingham new street and should leave on sunday
I can help you with that.  Do you have a time preference?
Yes I need to arrive by 14:30.
I have train TR9644 arriving by 14:23,is that good for you?
Yes could you please book it for me and get me a reference number?
How many tickets do you need?
I need 1 ticket please. 
I have 1 ticket booked on TR9644. The cost is 60.08 GBP and your reference number is CFPQ0W33. Can I help you with anything else?
Yes, I'd like to find an expensive hotel in the city centre.
Sure! Would you like to stay at the Gonville Hotel (3 stars), or the University Arms Hotel (4 stars)? Both have parking and internet.
Lets go with university arms, please book me for 1 person, 4 nights on sunday.  
All set, the reference number is IFHSYRZN, any other questions today?
Which ever one you recommend. I'll need it booked for 1 person, Sunday, 3 nights please.
You're all set! Your reference number is IFHSYRZN
Thank you for all your help.
Have a nice day.