This paper aims to uncover state-of-the-art on persuasion through a dialogue system between human and virtual agents. 37 participants interacted with six virtual agents in different conditions of facial expressions and camera angles. Through empirical measurements using the Big Five theory, we discover that virtual agents' friendliness becomes a solid persuading factor to our predominantly extroverted participants. The experiment deduces that openness, conscientiousness, and extraversion personalities are easily persuaded by our virtual agents, unlike reversedconscientiousness and neuroticism personalities.