I was hoping you can find me a museum in the centre. 
There are 11 museums in the city centre. I recommend castle galleries. Can I help with anything else?
Which museum is located in the centre? Can you give me a phone number and address please?
Try the Broughton House Gallery, at 98 king street. Their phone number is 01223314960.
Yes I also need a train to Bishops Stortford leaving after 20:15
I can get some train options for you if you tell me what day you want to leave and where you want to leave from.
I need to leave on Saturday from Cambridge.
TR1159 will have you in bishops stortford by 22:07. Would you like me to book that for you?
Yes, please book it for 6 people, and I need a reference number.
Okay, I've booked 6 train tickets for you. Your reference number is NW67NGNA. Is there anything else I can help you with? 
Nope, you helped with everything I needed today. Thanks!
You're welcome, have a great day.