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: 'I am a water junkie day to day but the place I am camping as a stream and I'm taking my water filter system, so I could offer you extra water in this case.' 'That is very considerate of you. 🙂' 'I see the proposed deal. Unfortunately, if you are going to take all the firewood. I will need more food and water.'
Utterance: 'that is totally understandable. Let me see what I can do 🙂'

Output: No


Input: Consider Input: Context: 'doesn't really seem fair for you to get all the firewood. I would like to have at least one because then we're completely in the dark.' 'You get lots of water and food for your children, I am cutting back on my goals by giving up energy which means I have spend more time outside hiking.  I do need to stay warm' 'yes which is why you have two firewood. I think it is fair for me to get at least one. If food is so important to you then I'll give you two food. but we would be in the dark'
Utterance: 'I suppose that's fair enough.'

Output: Yes


Input: Consider Input: Context: 'water, food then firewood. It's really hot so I need to make sure we are hydrated. We forgot a bag of supplies that had mostly food so we really could use food. It's hot so firewood isn't necessary. If anything we can get it from around or on a hike.' 'of course, we should help one another, we will figure something out i'm sure' 'Yes, I think we can. I'm thinking 3 water, 2 food and 1 firewood for myself? How does that sound to you?'
Utterance: 'i can't agree to that, the best i can do is 2water 1 food and 2 firewood for you, i have to have supplies too'


Output: Yes