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: 'Hello, I'm excited for our camping trip!' 'Hey buddy, yes I'm so pumped for it.' 'Okay so I'm planning this super cool backpacking expedition up the waterfall but I'm going to need all the additional water and food for everyone.'
Utterance: 'All of the additional water and food? That doesn't seem very fair. ☹️'

A: Yes
****
Q: Context: 'We likely need a lot of firewood and some water to put out the fire when we are done lol. What are you thinking?' 'Yea, I'm not too into firewood because it will be quite hot when I make my camping trip. I could definitely use some more food just in case of an emergency out there.' 'Then how about I give you all my food in exchange for all the firewood and since I have to put out the fire, maybe 2 water for me and 1 for you?'
Utterance: 'That sounds like a fair deal. I have no problem with that one.'

A: Yes
****
Q: Context: 
Utterance: 'hi there, i'm hoping we can come to an agreement on these extra items 🙂'

A:
Yes
****