"Reservation successfully sent!" how to change this message?

Hi,

I’d like to change the text that appears after submitting reservation by form.

Now the message is:

Reservation successfully sent!! Please continue by paying through PayPal or enter your credit card details.

How can i edit this? I’ d like to change it with something like “Check your email, you’ll find instructions to… blablabla”

When you add the form with the shortcode creator you can define that message.
Regards