MY DAUGHTER IS MISSING, PLEASE HELP

Please help me find my daughter. Her name is Samantha (Sammy) Smith. She is 24 yrs. old, about 5'10",approx. 200 lbs, brown hair and eyes, wears wire rim glasses. DOB 11-3-82. Last seen Monday 3-19-07, was headed to Joplin, Mo. Her hometown is Springfield, Mo. She was in the company of 2 young men one white male name is Mike, one black male name of Cory. Was supposed to go to see about a job to work for a traveling carnival, and has not been since or heard from since Monday March 19th, 2007. Called the company today and they had not seen or heard of her. Left under good terms with family and friends, and has not been heard from since. She would normally contact either one. If you have seen her please contact me here and how to contact you, Thank you for any help. This seems odd but this is her first time away from home. She may have got in trouble, is hurt, just don't know, PLEASE HELP US FIND HER, THANKS! Her picture is on my page!