hi , i would like to book a taxi from a and b guest house to saint catherine s college .
{'service': 'taxi', 'act': 'request', 'slot_name': 'leave', 'value': '?'} {'service': 'taxi', 'act': 'request', 'slot_name': 'arrive', 'value': '?'}
in order to book you a taxi i will need to know either when you would like to leave or arrive by ?