U: Need a train leaving on Thursday after 14:30

S: I found 195 trains that match your prerequisites. What is your destination?

U: I am going to London Liverpool Street from Cambridge.

S: Train TR3237 arrives at 17:27 and cost 16.60 pounds. Would you like me to book it?

U: No thanks, I'm not sure how many seats I'll be needing yet.

S: Okay. Just call us back when you do.

U: Oh, I am also looking for an African restaurant in the centre...North African, to be exact.

S: There aren't any in that particular area, do you have any alternative preferences?

U: Hmm, can you see if there might be an expensive restaurant that serves specifically "north african" food in the centre of town?

S: I apologize, but we are don't have any North African restaurants in this town at all. I do have an expensive African restaurant in the centre. Will that suffice?

U: No, if I can't get North African I'd really prefer something radically different. Chinese, maybe?

S: How about the Ugly Duckling? They serve chinese food and are located in the centre of the city.

U: Do they serve high quality seafood?
S: I couldn't find anything in the reviews about seafood at the Ugly Duckling. Would you like to try a different restaurant?