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.

Input: Consider Input: Context: 'I do not want my family to freeze either but walking away doesn't benefit either of us. How about I take the water and 2 firewoods, you have the rest' 'No deal, I need at least 2 firewood' 'Ok, I can agree to 2 firewood but I will have to take all the food and water to compensate'
Utterance: 'I am walking away, completely unfair'

Output: Yes


Input: Consider Input: Context: 'Yeah I need firewood too. It's only 50 degrees at night on the mountain, even in the summer.' 'How would you feel about giving me some firewood for food?' 'Maybe, I need food too but I want firewood the most.'
Utterance: 'Do you have a deal to offer?'

Output: No


Input: Consider Input: Context: 'I could use 1 pack of water, food and firewood.' 'You need a pack of each?' 'Yes, at least 1 of firewood, one of water and one of food.'
Utterance: 'Okay, that would work for me. I'm sure you have good reasons.'


Output: No