The input is taken from a negotiation between two participants who take the role of campsite neighbors and negotiate for Food, Water, and Firewood packages, based on their individual preferences and requirements. Given an utterance and recent dialogue context containing past 3 utterances (wherever available), output Yes if the utterance contains the vouch-fair strategy, otherwise output No. vouch-fair is a selfish negotiation strategy. It is used to call out fairness for personal benefit, either when acknowledging a fair deal or when the opponent offers a deal that benefits them. This can be through an explicit call out or can be implied.

Example Input: Context: 'Oh yes, sorry I am so caught up with my wound I completely forgot about that. I can spare 1 firewood so you would get 2, do you think you could spare another water in exchange for the wood?' 'i cant unfortunately i really need the two water im sorry. ' 'im so sorrry unfortunately i am in dire need of two wood we are in a very cold climate'
Utterance: 'how about i get 1 water, 2 food, and 2 firewood since I'll be here so long? because of my leg i likely won't be able to leave anytime soon'
Example Output: Yes

Example Input: Context: 'Okay so we can think about splitting the firewood. 🙂 I'm also interested in water because I plan to do a lot of activities like hiking and kayaking, so it will be helpful for me to be able to hydrate more.' 'That is okay. What about i get 2 packages of firewood and then you get 2 packages of water. Is that okay with you?' 'Since I'm most interested in firewood, I would want 3 waters if you're going to get more firewood.'
Utterance: 'Nice. That's okay with me. You get 3 waters and a I get 3 firewood'
Example Output: No

Example Input: Context: 'Hi! I'm really hoping to get a lot of water. I love outdoor activities like hiking and kayaking so I'll need to stay hydrated on the trip.' 'Hi! I really need water also. I'm trying out a few new recipes, and they call for a lot of water.'
Utterance: 'Okay, maybe we can split the water and then divy up the rest. What else are you interested in?'
Example Output:
Yes