I need a train to leave from cambridge after 15:30.
Ok, lets get you set up, where are you going and on what day?
I will be leaving on saturday and going to london liverpool street. 
I would recommend TR4859 which leaves Cambridge at 15:59 and arrives at London Liverpool Street at 17:27. 
That sounds fine. Can you reserve 6 tickets for me please?
You're all booked.  TR4859 for 6 people will be 79.67 GBP.  Your reference number is CTETVS75.  Is there anything else I can help you with today?
I am looking for places to go in town. The attraction should be in the type of museum
There are 23 museums in cambridge.  Are you  interested in a particular type of  one in a certain part of town?
Not really.  Pick the best one for me!
I am very partial to the Cambridge Artworks museum located at 5 greens road and admission is free. Does that sound good?
That sounds great! What area and can I get the postcode?
It is located in the east and the postal code is cb13ef.
Great, thanks, that's all I need!
You're welcome, glad I could help.