WELL I AM NOT GOIN BUT I CAN GIVE A SUGGESTION BRO...
U CAN CALL THE OFFICE OF THAI AIRLINES IN  U.S. AND ASK THEM WHETHER THEY GUIDE PPL WHO CAN'T SPEAK NOR UNDERSTAND ENGLISH IN AIRPORTS... I THINK THEY DO... BUT I HAVEN'T DONE THAT WID THAI TILL NOW... MY MOM CAME HERE AND SHE CANT SPEAK ENGLISH BUT SHE UNDERSTANDS IT A BIT... AND SHE TOOK CATHAY PACIFIC... AND THEY PROVIDED A GUIDE  FOR HER... AND IT WAS FREE... SO WAT THEY DID WAS THE STICKED A BADGE SAYIN SHE CAN'T SPEAK ENGLISH... AND SHE WAS TAKEN TO HER TRANSIT AREAS BY THE GUIDE.. I THINK THE GUIDE IS ONLY RESPONSIBLE FOR PICKING UP UR PARENTS FROM THE PLANE AND TAKING THEM BACK TO THE PLANE DURING TRANSIT...
SO I DO HOPE THIS HELPS U... GOOD LUCK