success: Boolean indicating whether the message was sent successfully (true = sent, false = failed).
message: Object containing metadata about the message that was sent.
reservationId: Identifier of the reservation associated with the message.
messageType: The communication channel used to send the message (e.g., "email", "sms", or "channel").
messageId: Unique identifier for the message that was sent.
message: The actual content/body of the message sent.