yes , i need a train to kings cross on tuesday .
user
okay . where are you departing from ?
assistant
the main city hall
user
i do not show that there are any trains departing from city hall . would you like another departure site ?
assistant
yes , please . i will departing from cambridge .
user
and what time would you like to leave or arrive by ?
assistant
i need to leave by 17:00 .
user
there is a train at 17:00 going to kings cross . would you like to book a ticket on that 1 ?
assistant
i apologize . i meant to say that i need to leave sometime after 11:30 .