How could we run a specific request with a specific data in JSON data file?

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Hi all,
I have a json data file, and list of request as “Get a single booking”, “Get a bulk booking”… inside a folder “Get a single booking”.

  • The request “Get a single booking” has URL: {{baseURL}}/booking/{{bookingId}}
  • In folder “Get a single booking”, I configure Pre-request script:
    let requestName = pm.iterationData.get(“requestName”);
    postman.setNextRequest(requestName)

The purpose is each iteration will call a specific request_name, and assert the corresponding data
Let say:

  • iteration 1 sees the request name “Get a single booking” => call this request and ignore the others => assert the response data

  • iteration 2 sees the request name “Get a bulk booking” => call this request and ignore the others => assert the response data

But actually, The iteration variable is always 0, and calls to “Get a single booking”. How could we achieve that.

  {
    "requestName": "Get a single booking",
    "bookingId": 1,
    "expectResponse": {
      "firstname": "Sally",
      "lastname": "Jones",
      "totalprice": 992,
      "depositpaid": false,
      "bookingdates": {
        "checkin": "2015-04-17",
        "checkout": "2018-03-29"
      }
    }
  },
  {
    "requestName": "Get a bulk booking",
    "bookingId": 2,
    "expectResponse": {
      "firstname": "Mary",
      "lastname": "Jones",
      "totalprice": 890,
      "depositpaid": true,
      "bookingdates": {
        "checkin": "2015-08-21",
        "checkout": "2016-09-29"
      }
    }
  }