Thank you for contacting us text

When a user fills out a form, they get a thank you email with some boilerplate text:

We have received your message and will respond to you within 24 hours (Monday-Friday). For urgent inquiries, please contact us using phone numbers down below. Phone: 123-987-6543 Fax: 123-987-6542

Where do you update this and/or turn off these emails?