I need a train that leaves Cambridge at 21:30
And what is your destination for that trip?
I want to go to London Liverpool Street
I found 14 trains.  What day do you want to travel?
Thrusday. Can I also ask the price of these trains?
The price is 16.60 pounds. I have 2 matching trains. One arrives by 23:27 and the other arrives by 01:27. Do you want to book either?
No thank you. I am interested in finding an expensive place to eat in the centre of town. Any recommendations?
I have many restaurants like that. What kind of cuisine are you looking for?
I am looking to book a table for 2 at 12:45 on Thursday at a thai restaurant. 
The only expensive Thai restaurant in the center, Bangkok City, doesn't have any availability at that time. Would you like to try something else?
Can you change the booking time to 11:45, and try again?
Alright, you're booked at 11:45 at the Meze Bar Restaurant. Your reference number is UXHS88M3. Will that be all for today?
Yes, that's everything I needed. Thank You!
Thank You! Goodbye.