hello , i need to book a ticket going to cambridge arriving by 16:30 , can you help me with that ?
{'service': 'train', 'act': 'inform', 'slot_name': 'choice', 'value': 'a lot'} {'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'}
there are a lot of trains available . where are you departing from ?