I need a train leaving after 11:00 on wednesday if you can help me. 
Certainly. Where would you like to go?
I need to go from Cambridge to London Liverpool Street. 
I have TR4604 leaving at 11:59 and arriving at 13:27. Would you like to make reservations?
Yes please make a booking for 1 people.
I was able to book you for train TR4604. The total fee is 16.6 GBP.  The Reference number is : IG31YH6P.
I need to find a place to stay.
Okay what is your price range?
I would prefer a guesthouse in the cheap price range. thanks
We have many to choose from! Is there an area in town you want to stay in?
I'm not sure but it needs to have free wi-fi. Do you have some with those specifications?
there are nine places that are cheap guesthouses and offer free wifi and free parking. if you know an area i can narrow it down or i can suggest one. 
I am open to any area, whatever you suggest is fine.
okay when are you planning your stay so I can book the room
I Need a cheap guesthouse with free wifi. I would like it to be a hotel.
I'm sorry, but your message is ambiguous. Would you like to stay in a guesthouse, or in a hotel?
I would like a guesthouse.
Would you like me to book it for you and get a reference number ?