i am needing help with your train schedules . i will be departing from birmingham new street and arriving in cambridge on sunday at 18:45 . i would like to leave no later than 19:30 .
what is your planned itinerary ? what time do you want to leave by ?
{'service': 'train', 'act': 'nooffer', 'slot_name': 'none', 'value': 'none'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'}
there are no trains that match your criteria . can you verify the time you want to leave ?