do your research NOW, I guess it's an airline?
where do they fly too/from, what is their advertising slogans, what market are they aiming for.
Start with a script, write it out and try it out on someone
Look above their heads for most of the time but don't avoid eye contact( it helps you concentrate)
Dress for business,sort it out the night before(that will be tonight then
)
Get an early alcahol free night
make sure you know exactly where it is and how to get there and how long it takes to travel( book your taxi/lift, is there petrol in the car?
Look at selling something as if you want to buy it yourself?
And most important..
KEEP SMILING