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.

Q: Context: 'Actually, I'd like to keep some water as well in case it gets so cold that the lakes and other water sources freeze.' 'Well, I need as much food as possible. You seem to want firewood. How about you suggest something.' 'That's a good idea.Let me think. How about 3 Firewood, 1 Food and 2 waters for me.'
Utterance: 'That will not work for me at all. '

A: Yes
****
Q: Context: 
Utterance: 'I'd like to have 2 extra packages of water and firewood.'

A: No
****
Q: Context: 'Hello. I'm going to do a lot of hiking on my camping trip and need as much water as possible. I'm also planning a bonfire with fellow campers in the area, so I'd like as much firewood as possible. How about I keep the water and firewood and you keep the food?' 'That doesn't work for me. I will also need extra water because I drink a lot. How about we start by saying you get the firewood, and I'll take the food?'
Utterance: 'OK, but how do we split up the water? Because it sounds like we both need some. What if you take all the food and I take all the firewood and then I get two waters and you get one extra?'

A:
Yes
****