What's happening , officer ?   There is a fire in your building . You need to evacuate immediately .   What ? A fire ? Oh , my God ! What shall I do ? Please get me out of here !   Don't panic ! We'll help you get out of the building safely .   I can smell smoke !   Please follow my instructions . Use a wet towel to cover your mouth and nose . Walk quietly to th nearest emergency exit . Now go get the wet towel .   OK .   Come with me . 