I'm looking for a train to broxbourne.
Where would you like to leave from, and what day and time would you like to travel?
I'm going to be leaving from Cambridge. I need to leave on Tuesday by 13:00.
Is there a time you would like to get there by ?
I don't have an arrival preference. 
The earliest train leaves at 5:01. The latest train leaving by 13:00 would depart at 12:01. There is also one that leaves at 13:01. The trains run every hour.
Actually, I'd like to arrive by 13:00. Could you give me the train ID for the train arriving closest to that time? 
Train ID is TR6357. Would you like to book ?
No thanks. I'd just like to know the travel time please.
The total travel time is 60 minutes.  Is there anything else you need to know?
I need to find a expensive hotel in the north.
I don't have anything that matches your description. We do have some 4 star options in the moderate price range to offer or we could search in another part of town.
ok how about a guesthouse in the north that is expensive with free parking. 
I am sorry but there is nothing matching that request.  Would you like to try another price range or area?
Sure let's try a moderate price range. 
acorn guest house is a moderate piced 4 star guesthouse with free internet and parking. Would you like to reserve this one?
Can you give me the hotel, phone number, and postcode?
The hotel phone number and post code are 01223353888 and cb41da.
All set.  Thanks a lot. 
Have a nice day, goodbye!