``` powershell
Set-MailboxAutoReplyConfiguration -Identity <username> -AutoReplyState Scheduled -StartTime "1/1/2024 00:00:00" -EndTime "1/1/2024 00:00:00" -InternalMessage "Example,<br><br>Message here.<br><br>Thank you." -ExternalMessage "Example,<br><br>Message here.<br><br>Thank you."
```