Query: When was my last Hep A immunization?, FHIR Resource: {'resourceType': 'DiagnosticReport', 'status': 'final', 'category': [{'coding': [{'system': 'http://loinc.org', 'code': '34117-2', 'display': 'History and physical note'}, {'system': 'http://loinc.org', 'code': '51847-2', 'display': 'Evaluation + Plan note'}]}], 'code': {'coding': [{'system': 'http://loinc.org', 'code': '34117-2', 'display': 'History and physical note'}, {'system': 'http://loinc.org', 'code': '51847-2', 'display': 'Evaluation + Plan note'}]}, 'subject': {'reference': 'urn:uuid:be69263e-31b4-dca5-cdab-540b251b8ee9'}, 'effectiveDateTime': '2016-10-12T02:14:06+05:30', 'result': None}