No Confirmation or Successful Submission Message - Contact Form

Hello all,

When a customer submits a message through the contact form, no submission message is showing to let them know their message has been sent.
The message actually goes through and I get it on my shop’s mail box, but I’d like to add a successful submission message instead of just refreshing the page and deleting all the info from the fields.

It seems a very simple solution but the fixes I’ve tried don’t seem to work.

I’m copy-pasting my page.contact.liquid below (Simple Theme).
I’d appreciate your help.
Thanks!

{{ page.title }}

{{ page.content }}
{% form 'contact' %} {{ form_errors | default_errors }}
שם פרטי
שם משפחה
מייל
מספר הזמנה, אם קיים
תוכן ההודעה
{% endform %}