there is no "message successfully sent" text

when setting up the contact page, there is no way for the customer to know that their message has been sent successfully....

Is there a way to set up a notification that says - your message has been successfully sent or something like this?

There is already such message displayed by HikaShop.
If you don't see it, it's probably because of your template: www.hikashop.com/en/support/documentatio...issues.html#messages