gistfile1.js

    var showRebookDialog = function () {
        var $conversation = $(this).closest('.conversation');
        var providerUrl = $conversation.attr('data-provider-url');
        var requesterUrl = $conversation.attr('data-requester-url');
        $.getJSON(providerUrl, function (provider) {
            $.getJSON(requesterUrl, function (requester) {
                var view = new RebookDialogView({
                    el: '.js-rebook-dialog-container',
                    sender: provider,
                    receiver: requester,
                    provider: provider,
                    requester: requester,
                    service_url: $conversation.attr('data-service-url')
                })
            });
        });
    };