I'm interested in doing something touristy in the centre, where should I stop first?
there are several college, churches and museums in that area
Those all sound interesting. Do you have any recommendations?
How about the whipple museum of the history of science located at free school lane. Their entrance fee is free.
Sure, can I have the postcode?
Certainly the post code is cb23rh. Can I assist you with anything else?
I need information about a train on Sunday, leaving after 11:45.
And can you tell me your departure site please?
I am leaving from Cambridge.
the tr7447 leaves at 13:00
That sounds great. Do they have 7 tickets available? If they do reserve the tickets and I need the reference number.  
Reference number is : ZHM8KDQA. Do you need anything else?
No. Thanks for your help. You have been really nice.
You are welcome.  Have a nice time in Cambridge.  Goodbye.