Hi,

You can set email title and content in theme options panel. 

http://prntscr.com/lu9bcb

And you can use some variables in email content and you can check it in http://soaptheme.net/document/travelo-wp/#theme_settings_accommodation_tab 

Regards, C-Themes

hello, I want to know how to set the mail information I receive after a reservation

attached the capture of the mail that I receive