i am looking to book a taxi to pembroke college for this evening . i need to leave from primavera
where will you be departing from ?
{'service': 'taxi', 'act': 'request', 'slot_name': 'leave', 'value': '?'} {'service': 'taxi', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
great , do you have a leave by , or an arrival time in mind ?