can you get me a train leaving after 18:15 departing from cambridge ?
user
sure ! what day are you leaving ? where are you heading to ?
assistant
i need to go to norwich on friday .
user
there are several . you can leave as early as 18:36 , and as late as 23:36 . trains are every hour . which would you like ?
assistant
18:36 , please . book for 8 people . give me the reference number .