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: 
Utterance: 'Hello. I would like to take the following items. (2) Firewood, (2) Water, and Food (2)'
Example Output: No

Example Input: Context: 'How about water? do you need? I can offer 2 of these for 1 pack of food' 'I have plenty of water right now, but need at least 1 pack of food for myself.' 'OK. Do I get the water then? You can at least take a pack'
Utterance: 'Yes, that works for me. 🙂'
Example Output: No

Example Input: Context: 'You get 2 food, 1 firewood and 1 water' 'I am okay with that deal. What is your opinion?' 'sounds good. I will go ahead and put it in on my end'
Utterance: 'Okay. I will give you 1 food, 2 water and 2 firewood'
Example Output:
No