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: 'It is even worse here and I am not feeling well' 'I am just going to walk away from the deal,  my family can't freeze' 'You can take 1 firewood then'
Utterance: 'C-ya, thanks anyways'
Example Output: No

Example Input: Context: 'I am going to need some food of course. ' 'yes ofcourse i agree with you.my dear friend will you have 1 food 3 firewood and 3 water' 'I would prefer 2 food and less firewood. There is tons of firewood where I am but there is no lake so I can't fish. No berries around here either. It's pretty scarce'
Utterance: 'okay is 2 food 1 firewood okay for you while i get 1 food 2 firewood and 3 water'
Example Output: No

Example Input: Context: 'I would like all food and 1 water' 'You can have all the water if I can have all the food.' 'how about 2 food for me, 2 water for you?'
Utterance: 'How about 2 food for me, 2 water for me, and you can have everything else'
Example Output:
No