i need to book a train ticket going to cambridge any day but has to arrive by 18:30 , can you assist me with that ?
{'service': 'general', 'act': 'greet', 'slot_name': 'none', 'value': 'none'} {'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'}
i will be glad to help you with that . where will you be departing from ?