One Full Year Personal Consultation Service Without a single penny's additional cost, you will be privileged to use the famous Cortina Personal Consultation Service. At any time during the year, you may ask questions relating to your Cortina lessons. Your questions will be answered by an experienced instructor – promptly and fully. It's almost like having your own private tutor as you learn Vietnamese. Many students have told us that this Personal Consultation Service alone was worth more than the price of the entire Course.