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: 'Hello. How are you?'
Utterance: 'I am good. I am pretty excited for the trip this weekend. what about you?'

Output: No


Input: Consider Input: Context: 'That sounds reasonable. I don't particularly need the food because I see that as more of a luxury but I could really use some more water. It's supposed to get really really hot on the weekend. 😮' 'I hear that. What do you think of if I take 3 of the food supplies and you can have two waters? ' 'That sounds like a fair compromise. I can get food by hunting animals, old school style. That would give you 4 total items. In that case it's only fair if I take all 3 of the firewood. 4 for me and 4 for you sounds like a good deal to me. 🙂'
Utterance: 'That sounds fair to me! I don't know the first thing about hunting so that would be a relief on me. We took a bunch of blankets so we'll be good on firewood.  🙂'

Output: Yes


Input: Consider Input: Context: 'ha no prob on the wood, its out there in nature so i can do with less of it hows 3 water, 1 food, 0 wood sound' 'I'll need at least one water dude. I don't have any beer. 🙂' 'were getting closer - id do 2 water, 2 food, 1 wood'
Utterance: 'I don't know. You are geting more items. That's greed bro :-)'


Output: Yes