I'm looking for a train. I want it to go to Stevenage and leave from Cambridge.
There are many trains available. What day and time do you want to travel?
It should leave after 18:30 on Saturday.
I have a train leaving at 19:21, is that okay?
How long is the trip and when will I arrive? Also need to know the price.
The trip lasts 49 minutes and is 12.8 GBP. 
Okay, thank you for that information.  I also need to find a cheap restaurant. 
We have many available. Do you have a certain type of food you would like? 
Anything cheap in the centre of town please.
There are several places what type of food would you like?