I am planning a trip to Cambridge
How great! I'm sure you'll love it here. Is there something specific I can find for you? 
train should leave after 11:15 and should depart from stansted airport on Sunday
Okay, the TR9445 leaves at 11:24 and arrives by 11:52. Would you like me to book tickets for you?
Yes, please. I'll need tickets for 5 people. 

Booking was successful, the total fee is 40.4 GBP payable at the station . Reference number is : 38E1SSYP.
I'm also looking for a restaurant in the moderate price range, that serves Thai food.
Im sorry there are no restaurants like that. Would you like to search for something else?
No moderately-priced Thai places in the east, huh?
There are not - would you like to adjust the type of restaurant or the price range?
Let's try Indian food. 
Do you have a preference - I come up with 2.   Curry Prince, or Rajmahal.  I recommend Curry Prince.  Is this okay?
Curry prince is good. book it for the same group of people please
Okay. I'll need to know the day and time you'd like to dine. 
On Sunday at 20:45 please.
You are all set for Curry Prince. Your reference number is 7FLIG346.
Ok, great, that's all I needed! Thanks!
Great. You have a wonderful day and feel free to message me if you need any more assistance.