hello ! can you give me information about trains going to cambridge and leaving on wednesday ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'over 200'} {'service': 'train', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
there are over 200 trains leaving . do you have a specific time you would like to arrive by ?