Be Conversational but Professional

Approach your audience with a open, warm and friendly tone but not overly formal. Avoid slang and low-level diction. 

Avoid slang words:                    

• Kinda
• Ain't 
• Sorta 
• Wanna 

When approaching your audience be prepared, organize your speech but don't be tied to your notes.Talk to your audience not at them don't assume that your audience shares the same beliefs that you do. Recognize that you must learn about them before you speak to them, you should avoid relying on intuition cause its often wrong.

(Reference: Guffey, M., & Loewy, D., & Rhodes, K., & 

Rogin, P.(2013). Business communication process and product. Adapting a Message to Its Audience, p.90)

(Reference: McGraw-Hill. (1998). Public speaking. Speaking to an audience. Retrieved from http://www.mhhe.com/socscience/comm/new-home/tutorial/select/speaking.htm)