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.

Example Input: Context: 'I'll only give you all the firewood if you give me everything else. I know it's your top priority😮' 'How about I take all the wood, give you all the food, you can have 2 waters and I can have one.  Having a little extra water will help me with all the hiking we will be doing, plus since i wont be eating much I want to stay hydrated.  Will that work for you>>🙂' 'cringe ☹️. Ill take one firewood and two of both water and food '
Utterance: 'Sorry - I just cant do that.  I want to come to an agreement but dont feel that its fair.  '
Example Output: Yes

Example Input: Context: 'No I was thinking I would get all the waters and you get 1 firewood or I get one food 2 waters and 2 firewood. ' 'We packed enough water but the kids spilled some so I just wanted to make sure we have additional water in case we run out. But we can do with only 1 water. We do really need the food though ☹️' 'So do I. I'm trying to bulk up because I've been skinny all my life. ☹️ Let me just get one please☹️☹️☹️☹️☹️☹️'
Utterance: 'well we do not want to be unreasonable. How about we take 2 food, 2 water then just in case they can be satisfied with the extra water. In that case you get 1 food, 1 water and all firewood. '
Example Output: Yes

Example Input: Context: 'As you need 2 of firewood, I think we can have a fair deal like 1-2 of food and firewood or 2-1 of food and firewood.' 'Ok Im thinking I need plenty of food to for my small children. I have a rather large family so there is more of a need. ' 'Can I have 2 of firewood in that case, as I have food that needs to be cooked and would be a great help.'
Utterance: 'Can I have 2 firewood 2 food and 1 water I think this would be enough'
Example Output:
No