Do not send an email about the reservation for a visitor

Do not send an email about the reservation for the visitor. The administrator receives notification of a new reservation, but the visitor does not! In the admin panel I try to send a letter about the status change to the client, but it is also not sent. Help correct the error

Thank you in advance for your cooperation!

Regards…

Please try to install a wordpress SMTP plugin and try another sender email.
Regards

Thanks for the help!