I am running low on firewood. I need more to keep the fire going and cook food. 
Yeah I need firewood too. It's only 50 degrees at night on the mountain, even in the summer.
How would you feel about giving me some firewood for food?
Maybe, I need food too but I want firewood the most.
Do you have a deal to offer?
I would like 2 firewood, and I don't care about anything else. I would give you 2 water and 3 food
I will give you 1 firewood for 3 waters and 3 foods. 
Nah I'll pass
Do you have another deal to offer? ☹️
I'll give you 3 food and 3 water and 1 firewood Walk-Away