Administrative Assistant Job Description. Be at the office from 9:00 am to 5:00 pm, excluding a 45-minute lunch break. Greet anyone entering the building and assist with their needs. Answering the phone during business hours and other LineOne upkeep. Assist the Executive Directors and Department Directors with clerical duties as needed. Communicating timelines based on the current workload. Conference Room Calendar schedule online and post the sc...