public SetMessagesSeenRequestDTO(long messageId, string username)
 {
     RespondRequest = new respondRequest()
     {
         respondId = messageId,
         message   = new messageToSend()
         {
             senderUsername = username
         }
     };
 }
 public SendMessageRequestDTO(long reservationId, long messageId, Message message)
 {
     RespondRequest = new respondRequest()
     {
         respondId = messageId,
         message   = new messageToSend()
         {
             senderUsername = message.Sender.Username,
             messageContent = message.MessageContent,
             reservationId  = reservationId
         }
     };
 }