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'm not familiar with my surroundings. None of us going have ever been to this spot.' 'I mean I would give two waters if I could get one more food. So 2 water for you and 2 food.' 'I'd like to keep all the firewood if I'm giving the majority of the water.'
Utterance: 'Ok, that seems fair.'

Output: Yes


Input: Consider Input: Context: 'Hello, I'm in a strong need for food and water. Please let me have a few packages of food and water. I'd gladly trade all my firewood for it.'
Utterance: 'Hello. Wow! That does not sound good. My sister just called and let me know she will be coming tonight. She is bringing food so i have plenty to share. 🙂'

Output: No


Input: Consider Input: Context: 'Alright. I have a  feeling we will have a deal then. How about you give me two water for a firewood?' 'that sounds like a plan' 'how many firewood you need? Maybe we could also exchange one food for one more firewood?'
Utterance: 'I would appreciate that, I was thinking of asking that! I would not require much in the way of extra food or water but the fire wood would be important!'


Output: No