I'm looking for a place to stay that has free parking.
There are quite a few hotels with free parking! Where in the city would you like your hotel to be located? 
I am planning my trip to Cambridge. I am looking for a cheap place to stay the hotel should be in the cheap price range and I want the hotel to be in the type of a guesthouse.
There are a few guesthouses available.  What area would you like to stay in?
Area doesn't matter to me, but I would like it to have free parking. Tell me about your favorite?
allenbell is by far my favorite with free parking. 
Great, can you book a room for Thursday?  I will be alone and need to stay for 3 nights.
Hmmm, it looks like I can't book that right now, would you like to shorten your stay, or tray another day? 
Can you try for 2 nights instead? 
Booking was successful. Your reference number is HRAL8TCK. Can I help you with anything else?
Yes.  I need a train that leaves Cambridge and goes to Bishops Stortford.
What day would you like to travel? And do you have a preference for time of day?
I'd like to travel on Saturday and arrive by 19:30.
Train TR0969 will arrive by 18:07 would you like me to book it?