Authorities are asking for the public's help finding a missing 34-year-old woman who was last seen Wednesday evening in northwest Oklahoma City.An Endangered Missing Advisory was issued for Lindsay Mathes, who was last seen shortly before 7:10 p.m. on Wednesday near Pennsylvania Avenue and Highland Park Boulevard. She is 5 feet, 3 inches tall, weighs 115 pounds and has brown hair and brown eyes.The advisory says Mathes was wearing a black long-sleeve hoodie with a zipper, blue jeans and a black backpack. Authroities say Mathes has been diagnosed with schizophrenia and bipolar disorder. Anyone with information about her location is asked to call 911.