It's important to approach the conversation about a salary increase in a professional and respectful manner. Based on industry standards, a reasonable request for a salary increase after two years of employment could be anywhere from 5-10%. However, it's important to consider factors such as your job performance, the company's financial situation, and overall market conditions. Before approaching your supervisor, research salary ranges for similar positions in your industry and location to determine a fair and reasonable increase. Additionally, emphasize your accomplishments and contributions to the company as justification for a raise. Remember to stay flexible and open to negotiation if needed.