i am looking for a train departing from london kings cross .
user
there are 70 trains departing , what is your destination ?
assistant
i would like to arrive in cambridge on tuesday by 17:00 .
user
of course . when would you like to leave ?
assistant
it does not matter as long as i am in cambridge by 17:00 .
user
sure , train tr0269 arrives by 16:08 . that is the last train to arrive by 17:00 . would you like to book it ?
assistant
yes , please book the train for 4 people .