Definition: 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: Context: 'Hey there - looks like we are both going camping!  I'm from the South so firewood and water are a high priority for me.' 'Wow, thats awesome! Yes, I am! Well, that's great because water isn't super important for me. Firewood is though. '
Utterance: 'That sounds awesome - I'm sure we can come to an agreement on how to allocate that works for both of us.  '

Yes