Can you tell me whether there are colleges open to sightseers in the city center?
There are several places, churchill college is available.
What is the address?
Churchill College is on storey's way.
Can you give me the phone number also?
Churchill College can be reached at 01223336233. Is there anything else I can help with today? 
I'm also looking for a cheap Indian restaurant, can you recommend one for me? 
Sure, I would recommend Kohinoor Indian restaurant in the Centre. Would you like a reservation? 
Sounds good. Can I get their phone number and address? 
Their address is 74 Mill Road City Centre and the phone number is 01223323639. Can I help you with anything else?
No, you've taken care of everything for me today! Thank you!
You're welcome.  Enjoy your visit to Cambridge!