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: 'Good morning' 'Hi, how goes it?' 'It's going alright. What do you need the most to trade?'
Utterance: 'well, I run and could use some extra water. How about you?'
Example Output: No

Example Input: Context: 'firewood' 'what/ we have same priority items, how do we split this to ensure equitably ' '2 food , 1 firewood ,2 water for me is it ok?'
Utterance: 'not fair at all☹️'
Example Output:
Yes