I'm trying to plan a trip there. I need to find a cheap restaurant.
Would you like chinese or asian? Charlie chan serves chinese and is on the cheap side.
No, I would like an Italian place in the centre. 
There are three: Pizza Hut City Centre, Ask, and Zizzi Cambridge. Would you like to make a reservation at any of these?
Ask sounds good. What's the postcode?
The postcode is cb21uf, will that be all?
I am also looking for a train departing from cambridge on tuesday, and arriving at ely by 17:15.
The train arriving closest to 17:15 is TR4447 which arrives at 16:07. Would you like for me to book that for you?
Before I book anything can you give me the price?
The price is 4.40 pounds. 
How long does the train take to get to Ely? And when, precisely, does it leave?
The TR4447 leaves at 15:50 and it's a 17 minute ride, arriving at 16:07. Should I book it for you?
Before I book anything, what is the price?
the price is 4.40 pounds
Thank you, please book me.
How many tickets will you be needing? 
Just one ticket, please! 
Congratulations! Your booking was successful and your reference number is SED9S4BH.
Thanks for your help
You're more than welcome. Can I help you with anything else?
I think that is all I need for today. Thank you.
Thank you for contacting Cambridge TownInfo centre.  I hope you have a pleasant trip!  Goodbye!