Request:
GET /baseDstu3/Slot?schedule=4a&status=free HTTP/1.1
Host: ehealth-ask.fokus.fraunhofer.de
Content-Type: application/xml
Authorization: Bearer aaa
cache-control: no-cache

Response:
{
  "resourceType": "Bundle",
  "id": "ae66ae42-f5e5-4d23-b4d2-53156f434dda",
  "meta": {
	"lastUpdated": "2019-01-29T14:57:02.378+00:00"
  },
  "type": "searchset",
  "total": 1,
  "link": [
	{
	  "relation": "self",
	  "url": "https://ehealth-ask.fokus.fraunhofer.de/baseDstu3/Slot?_format=json&schedule=1a&status=free"
	}
  ],
  "entry": [
	{
	  "fullUrl": "https://ehealth-ask.fokus.fraunhofer.de/baseDstu3/Slot/818c0b1b-1f8b-4979-ada5-707014deb2a1",
	  "resource": {
		"resourceType": "Slot",
		"id": "818c0b1b-1f8b-4979-ada5-707014deb2a1",
		"meta": {
		  "versionId": "1",
		  "lastUpdated": "2019-01-23T17:29:43.352+00:00",
		  "profile": [
			"http://ask.fokus.fraunhofer.de/fhir/StructureDefinition/VideoConferenceSlot"
		  ]
		},
		"identifier": [
		  {
			"use": "official",
			"system": "urn:oid:1.2.276.0.76.3.1.158.20.4.3.1",
			"value": "2b2026cf-f196-434b-9e31-0cbf8a9730d8"
		  }
		],
		"serviceCategory": {
		  "coding": [
			{
			  "system": "http://hl7.org/fhir/service-category",
			  "code": "17",
			  "display": "General Practice"
			}
		  ]
		},
		"serviceType": [
		  {
			"coding": [
			  {
				"system": "http://hl7.org/fhir/service-type",
				"code": "124",
				"display": "General Practice"
			  }
			]
		  }
		],
		"schedule": {
		  "reference": "Schedule/1a"
		},
		"status": "free",
		"start": "2018-11-29T08:00:00.000+01:00",
		"end": "2018-11-29T08:15:00.000+01:00"
	  },
	  "search": {
		"mode": "match"
	  }
	}
  ]
}