question: What is the Termination of Mission date for Marsha E. Barnes, the Ambassador Extraordinary and Plenipotentiary?
answer: SELECT termination_of_mission FROM table_name_34 WHERE title = "ambassador extraordinary and plenipotentiary" AND representative = "marsha e. barnes"
context: CREATE TABLE table_name_34 (termination_of_mission VARCHAR, title VARCHAR, representative VARCHAR)