Let User Enquiry About the Listing on the Listing Single Page.

You can also add a custom form using the shortcode of the form in the field.

Where the Enquiry Data will go Directly?

For that, At first, check if there is any agent email added to the listing. If the email address is added then the mail from the contact form will be sent to the email address added to that field.
If it is not then the email will be sent to the agent who has been assigned to the listing.
And if nothing is added then the email will be sent to the owner of the listings.
And if you use a custom form there then the email will be sent to the email that is set to be sent in the custom form.