Is there a train from cambridge that arrives by 13:45?
I found several trains that meet your criteria. Would you like to narrow your search by picking a particular day or a certain destination?  
I will be travelling on Friday and want to arrive at Stansted Airport by 13:34.
I am seeing several options for you. Do you have a preferred departure time?
No, as long as it arrives before 13:45 on friday, it's fine.
I would recommend TR0188 which arrives by 13:08. Would you like to book a ticket?
No thank you but I do need to know the price. 
The price is 10.10.  Can I help you with anything else?
Can you help me find a place to stay in the south?
What is your price range? What number of stars do you prefer? 3 or 4?
i would prefer 3 stars.
There are two 3 stars in that area. One is a guesthouse and the other is a hotel. Would you like for me to make a recommendation?
I'll take the hotel.  Please book for 2 people starting on monday for 4 nights. 

Booking was successful.
Reference number is : XURZLO9G. Can i help with anything else?
Thank you for your time that is all I needed today. 
Well thank you for calling.