form with ajax dosen't send values
You need to place 

 $form['hotels']['rooms'] = array(
    '#collapsed' =&gt; '0',
    '#type' =&gt; 'fieldset',
    '#collapsible' =&gt; '0',
    '#prefix' =&gt; '&lt;div id="globallink-ui-rooms-change-wrapper"&gt;',
    '#suffix' =&gt; '&lt;/div&gt;',
);


in globallink_ui_search_form function. The wrapper tag must be loaded before callback send.