i am looking for a train . i need to leave on tuesday and want to arrive by 20:45 .
{'service': 'train', 'act': 'request', 'slot_name': 'depart', 'value': '?'} {'service': 'train', 'act': 'request', 'slot_name': 'dest', 'value': '?'}
where are you departing from ? and where would you like to go ?