i want a train leaving on sunday and arriving in cambridge .
user
i have 202 trains matching your preferences . what location would you like to depart from ?
assistant
i am leaving from birmingham new street any time after 13:15 .
user
i have 11 trains matching your preferences . leaving every hour at :40 starting at 13:40 . which would you prefer ?
assistant
i'll take the first train at 13:40 for 7 people please and i will need the reference number as well .