i need to catch a train this tuesday after 17:00 please .
user
i can help with that ! what is your departure site and destination please ?
assistant
i will be travelling from cambridge to ely .
user
what time would you like to arrive by ?
assistant
arrival time is not important as long as i am on my way sometime after 17:00 on tuesday .
user
i will recommend tr3842 . can we book for you ?
assistant
what time does it leave ?