I love the centre of Cambridge but I always spend too much, are there cheap places to eat there so I can stay within my budget?
Yes, there are several. Charlie Chan serves Chinese food, there's Mahal of Cambridge for Indian, La Raza has Spanish cuisine, and there are a few others. Would you like more?
restaurant should serve indian food is what I need 
There are three cheap Indian restaurants in the centre: Kohinoor, The Gandhi, and Mahal of Cambridge. Would you like to make a reservation at one?
HOw about mahal and can you give their phone number and postcode?
Their phone number is 01223360409 and their postal code is cb21rq.
Great.  I'm also looking for a train.  I need to leave after 16:15 from London Liverpool Street.
Which day would you like to travel by train?
I'll need it to be on Tuesday. I'm going to Cambridge. 
TR2855 will leave at 17:39, would that work for you?
make a booking for 1 people.
Make sure you get the reference number
I have booked the ticket for you, reference 4O9ZT5ZD.
thank you very much.
Is there anything else I can assist you with today? 
That is all, make it a great day!
Thanks! You have a great day as well!