1. Why email notification doesn't working?
Answer: You need to configure joomla email setting, then configure application setting with email parameter
2. How to filter airport list in select search form
Answer: Put country_id of airport information in the menu parameter or module parameter ( if you setup search box by module)
3. Where I can get email template
Answer: You can download at: http://demo.joombooking.com/email.txt
4. How to put main currency code
If you use paypal as payment gateway, Look up your currency code at https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_nvp_currency_codes