i would like to find a train that will arrive in cambridge by 19:30 .
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'several'} {'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'}
i found several trains for you ! where would you be departing from ?