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: 'Do you have food? I have been trying to hunt but have not really found any animals nearby to hunt.' 'I do actually!  I can give you 3 foods. Would that work?' 'Sure, I can do that.'
Utterance: 'So if I give you 3 woods, can you give me 3 firewoods and 2 waters?'
Example Output: No

Example Input: Context: 'Hi how are you?' 'I am good. How are You.   I was just thinking about how I need extra water due to a medical condition.  How about I take all 3 waters?' 'I am okay. How about I give you one and half then I get some firewood from you?'
Utterance: 'No I need at least 2 waters.  But I am willing to give you all 3 foods, if I get all the firewood.  Does that work for you?'
Example Output: Yes

Example Input: Context: 'That would be a problem since I need the water too. I was hoping that since you got 2 foods ill get the 2 waters' 'Ok, I totally get that. So give me your total breakdown. I get how much of what, and you get how much of what?' 'So in total I would get 2 water, 2 fire wood, 1 food. 2 food 1 one of everything else '
Utterance: 'What if I take 1 more firewood, so I would have 2?'
Example Output:
No