i need informant on trains .
user
okay what information do you need per say ?
assistant
i would like a train from cambridge to london liverpool street , arriving by 21:30 on tuesday .
user
tr3515 will arrive at 21:27 , would that work for you ?
assistant
sure . could you tell me the typical travel time , and price for a ticket ?
user
the typical travel time is 88 minutes and it is 16.60 pounds per ticket . would you like for me to book that for you ?
assistant
no . could you please find me a restaurant in the center of town in the expensive price range ?
user
we have 5 different restaurant -s in the centre . 2 of them are expensive , 1 of them is african cuisine , the other is oriental cuisine . what do you prefer ?
assistant
what are the expensive ones ?