Hello
Hey!
How can I help you?
I was looking for a BMX bike and was hoping to find a good deal, can you help me out?
Sure. I'm selling this bike for $10
Oh interesting is that your bottom dollar?
Yes, I'm basically selling this for pennies. 
Yea I understand but just for fun would you be willing to drop the price closer to 5 if I run by the bank and grab you some coins?
Unless they're gold coins, I'm not interested. I'll take something else of equal value, though. 
Hmmm, I don't have any gold coins.... 
Then it's $10 or something of equal value. 
Okay I want the bike so I will pay your price of $10.00!