any trains leaving after 18:00 ?
user
there are lots of trains that leave after 18:00 . where would you like to travel ?
assistant
i would like to travel to the stansted airport and leave from cambridge .
user
great ! that narrows it down a lot . what day will you be leaving ?
assistant
we will be leaving on tuesday . please book 4 seats on the train and provide the reference number . thank you !