It is not necessary to have someone accompany you to Turkey because the hair transplant operation is performed under local anesthesia.  An adult can accompany you without any additional cost when you stay at the hotel in Istanbul.  Please make sure that you only bring one companion with you because if you bring more than one person with you to Istanbul you will have to pay extra money for accommodation to the hotel that you will be staying in.  In addition you are welcome to bring one child up to the age of six (6) for free.  If you decide to bring more than one adult with you to Istanbul or more than one child you will have to pay an extra twenty (20) Euros per night per person to the hotel.