conflict as far as skills and strategies to apply

Can you please help me with the steps to take to sequentially solve this conflict as far as skills and strategies to apply with the following scenario?

A Global ProTech employee contacts you, her HR professional, because she has a concern about her department manager, who she describes as rude and unappreciative. In addition, the employee expresses that she believes the manager has taken credit for her work on a project. She adds that her manager’s emails are often impersonal, harsh, and curt. She is frustrated and does not know what to do to improve the working relationship with her manager. You also meet with the manager to review the manager’s actions leading up to the meeting, along with the interactions between the manager and the employee. Then, you schedule a meeting with the employee and the manager to assist with managing this conflict situation. You realize that before the meeting, you need to take time to reflect on and plan the meeting agenda and what you will do.