i am looking for a place to stay, a hotel maybe, that has free wifi and should be a 4-star 
We have several that might suit you. The Cambridge Belfry is quite economically priced in the west, and there are also The Huntingdon Marriott and the University Arms.
I'm looking for a cheap one, which hotels fit into that price range?
The cambridge belfry is in the west and cheap. Would you like to me to book that for you?
What type of hotel is it and what is the postcode?
It is a regular hotel and the postcode is cb236bw. Would this one interest you? 
Maybe, I'll decide once I get there. Speaking of which, can you help me with a train to Cambridge?
Sure I can help with that, what time would you like the tickets for and how many?
I'd like to leave after 10:30 and depart from birmingham new street on Tuesday.
Train TR0734 leaves at 12:40.  Can I book you a seat on it?
Yes, actually I'd like to book 7 seats on it.
Good news! Booking was successful, the total fee is 525.69 GBP payable at the station .Reference number is : N680OYGM. Is there anything else I can do for you?
I believe that will do it. Thanks for your help! 
You're so welcome. Goodbye!