i am looking for a train from cambridge to london kings cross .
user
i see several options , all leaving on friday . is there a time you prefer to leave at ?
assistant
i need to leave after 17:45 on tuesday
user
there are 3 trains that match your request . they leave at 19:00 , 21:00 , and 23:00 respectively . would you like to buy a ticket for 1 of these ?
assistant
i'll take the earliest train . i need 2 tickets and the reference number .
user
booking was successful , the total fee is 47.2 gbp payable at the station . reference number is : 0kar945k . anything else i can help with ?
assistant
i am also looking for a restaurant . the restaurant should be in the expensive price range and should be in the centre