I need to find a train into Cambridge that will arrive by 09:15.
I can help you with that. Where are you traveling from?
I will be leaving the Stansted Airport on Thursday.
Perfect, I have train TR1472 that meets your criteria, would you like me to book a ticket for you?
Book it for 3 people. 
Sure. Your train is booked. The fee will be 30.29 GBP and your reference number is 7FGDRE1Q.
I need to find a place to stay as well. Can you help?
I need to know what you're looking for first.
I am looking to find a guesthouse in the centre of town. 
May I recommend Alexander bed and breakfast? It is a cheap guesthouse with a 4 star rating in the centre of town.
Are there any 4 star guesthouses in the centre that are expensive?
No there are not.  Would you like me to book the Alexander bed and breakfast for you?
how about one that is in the type of hotel?
I am sorry but there are no 4 star hotels either.  Would you like to try another star rating or area?
Are there any guesthouses in another area close by?
I'm afraid not. Would you like to try a different price range or star rating?
Are there any 4 star guesthouses in Cambridge?
Based on the criteria, there are no 4 star guesthouses that are expensive anywhere in Cambridge. 
I do not want to stay in a guesthouse. I want to stay in a hotel please. 
I have found two 4 star hotels that are in the expensive price range. One is located in the west, and the other Centre. Would you like more information?
I'm sorry.  The guesthouse would be my preference. It should be 4 star rated and in the town center. What's available that meets those specifications?
I'm sorry, there are not guesthouses that meet your criteria.  There is 1 guesthouse that is 4 stars in the cheap price range in that area of town.
Is there a possibly a hotel instead then?
Okay. I have the University Arms that is in the center, rated 4 stars and is in the expensive price range. Would you like me to book that for you?
Do they have free parking?
Yes of course they do, would you like a booking?
No, but can you give me the post code, please?
Yes, their postcode is cb21ad.  Is there anything else you would like to know?
Nope, that's it, thanks for your help!
Please let us know if we can help you in the future. Goodbye.