Relax, you will do great. Please read the following suggestion
(watermark will be removed once copyright is purchased)
Hi, Thank you for assisting on conference.
We are going to introduce simple ways to help our guests.
1) Greet everyone comes toward you with a smile.
2) Make sure your name tag can be clearly viewed so they know who they are talking to.
3) Make sure you know everything about the conference, locations, and where to find medical, phone booth, elevators, and exits.