Returns not available time Eg.: {'2014-05-14': [{'reserved_time': [{'from': '14:00', 'to': '16:30'}], 'type': "reserved_time"}, ...], ...}
{'2014-05-14': [{'reserved_time': [{'from': '14:00', 'to': '16:30'}], 'type': "reserved_time"}, ...], ...}