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.

Ex Input:
Context: 
Utterance: 'I have a family of 7 among of which 4 are in growing stages. Being the first time out with the whole family, we are less prepared and in much need of food.'

Ex Output:
No


Ex Input:
Context: 'I am okay. How about I give you one and half then I get some firewood from you?' 'No I need at least 2 waters.  But I am willing to give you all 3 foods, if I get all the firewood.  Does that work for you?' 'Okay I will give you 2 waters. I actually need more of firewood. If I can get 2 I will be glad.'
Utterance: 'Well I really need the firewood because I have small kids with me and it would be hard for me to get some free time to get the firewood, but I would be willing to give you 2 firewood since I get two waters.  What are your thoughts about the food?'

Ex Output:
No


Ex Input:
Context: 'I would need 2 food if you keep all the firewood. It would make it easier on me cooking wise since I'll have to look for wood' 'OK, that is fair.  So I would get 3 firewood, 1 water and 1 food and you would get 0 firewood, 2 food and 2 water.' 'I think that sounds fair to me'
Utterance: 'Sounds fair to me too. do we agree to submit the deal?'

Ex Output:

Yes