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: '☹️ I forgot most the food I was going to bring and only have enough for less than half the planned trip.' 'I understand. I guess we are in the same predicament. I have two kids with me though and they are hungry too. How long are you camping for? We are here a week.' 'I let my two girls bring their friend. Its their first overnight trip for more than a night. We also had a week planned.'
Utterance: 'My kids really eat a lot. But then yours probably to as well!'

A: No
****
Q: Context: 'That sounds good to me.  What about the food?' 'I would like 2 food, but you may have one. I wouldn't want you to be too hungry!' 'I don't want to be too hungry either but I think perhaps I might need an extra water to compensate for the lack of food.'
Utterance: 'Since I am giving you all of the firewood that you said was most important to you, I feel I should get at least the same amount of items as you, especially since you are getting exactly the firewood you want. I will need to stick to three waters and two food.'

A: Yes
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Q: Context: 'IF I can't get 2 pieces of firewood, I will walk away' 'oh that is too bad. I feel the same way.😮' 'Sorry we could not come to a agreement, I am walking away'
Utterance: 'OK. I am sorry it has to come to this. I really need the firewood as much as you do to keep warm as it is very cold where I am for this time of the year.'

A:
No
****