i would like to find a train going to cambridge that leaves on sunday . i would be leaving from peterborough . i need to arrive in cambridge by 19:30 though .
ok , and where are you departing from ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'few'} {'service': 'train', 'act': 'request', 'slot_name': 'leave', 'value': '?'}
okay , there are a few trains available . what time would you like to depart ?