I need a train that is departing from Cambridge and is leaving after 12:15.
Sure, let's narrow down your search. What is your destination?
I need to go to Stansted airport.
Okay we have a lot of trains that meet your requests, is there a specific time you want to get to the airport by?
No, I just need to leave Cambridge after 12:15 on Tuesday.
How many people in your party?
I am not sure yet. What are the prices for tickets?
The cost per ticket for that train route is 10.10 pounds. Can I help you book any tickets? 
no not at that time.Im also looking for a guesthouse to stay in that includes free parking in the expensive price range 
I'm sorry but there are no guesthouses that match your request, would you like a hotel or a different price range?
How about moderate?
There are several options would you like to be more specific on what you need?
I have no more specific needs.  Can you select your favorite and tell me their area, if they have internet, and how many stars they have?
Bride Guest House is in the south part of town and is in the moderate price range. It is rated 3 stars and has free internet and parking. 
Ok that's all the information I need, thank you for your time.
You're welcome.