This option will be managed from Other Settings > WhatsApp configuration > Gear Icon 
> Auto Message Responder
It is helpful to give answers to messages automatically. It means you have just written a message which will be sent automatically to the sender.
Customers received messages from auto responder message text automatically the first time or after 14 days of no activity.
Note: The Auto-Responder will function only if the WhatsApp bot associated with the connected WhatsApp number for the user has been deactivated.
