i need a train to cambridge that leaves after 13:30 . i'll be departing from kings lynn on tuesday .
there are several trains that are going to cambridge at that time where are you departing from ?
{'service': 'train', 'act': 'inform', 'slot_name': 'leave', 'value': '14:11'} {'service': 'train', 'act': 'inform', 'slot_name': 'id', 'value': 'tr4840'} {'service': 'train', 'act': 'offerbook', 'slot_name': 'none', 'value': 'none'}
train tr4840 leaves at 14:11 . would you like me to book it for you ?