i am looking for a train going to leicester leaving after 18:15 .
user
okay ! from where are you departing ?
assistant
i'll be leaving cambridge on tuesday .
user
there is a train leaving leicester at 18:21 and heading for cambridge . would you be interested in this 1 ?
assistant
no thanks , i need 1 going from cambridge to leicester . are there any that meet my needs ?
user
my mistake . it does depart from cambridge to leicester at 18:21 . would you like a ticket ?
assistant
yes please for 1 person .