i want a train leaving from leicester .
user
sure ! where would you like to travel to ? what day would you like to travel ? do you have any preferences on departure times ?
assistant
i'll be coming from leicester to cambridge on friday . i would like to arrive by 21:15 .
user
anytime you prefer to leave ?
assistant
no . just as i make my arrival time but not leave unnecessarily early .
user
the tr4170 leaves at 09:09 . will that work for you ?
assistant
yes can you book that 1 please ?