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.

Input: Consider Input: Context: '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.' 'The firewood is most important to me to be sure. However, if you get more food and all of the water I could end up going hungry.☹️' 'Well I would be happy to exchange you one of your firewood for the one water you need. That way you won't go thirsty.'
Utterance: 'Hmm, no I think I will agree with your first arrangement. I get 3 firewood and 1 food.'

Output: Yes


Input: Consider Input: Context: 'You can have all the water if I can have all the extra food' 'OK, but first tell me why you need extra food' 'I have 10 people in my group'
Utterance: 'I see. I need more water because I came across some people who were lost and they are very dehydrated.'

Output: No


Input: Consider Input: Context: 'Hi.  I can't do that right now.' 'Is there anything that you might need? ' 'I would be interested in firewood.  Can I ask you, what are your primary concerns on this trip?'
Utterance: 'My primary concerns are staying hydrated, I have been feeling sick and throwing up from being so high up in the mountains. '


Output: No