i would like to find a train leaving cambridge after 6:30 pm . can you help me ?
user
i would be happy to help you today . what is your destination ?
assistant
the destination is stansted airport , and i would like to leave on sunday .
user
i have a 06:40 that arrives stansted at 17:08 . would you like me to book that for you .
assistant
i apologize . i may have confused you a bit . i would like to leave after 18:30 .