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.

Example Input: Context: 'Me too. We have a bigger family and we will run out of food if we don't get some more.' 'Since it looks like we have the same value ranking for our needs, how would you like to try to make the deal?' 'Well let's try to make this as fair as possible.🙂We could get 2 packages of food, leaving you with 2 extra packages of firewood as well as water.'
Utterance: 'Sounds great to me! So I will get 1 food, 2 firewood, and 2 water. That sounds very fair 🙂'
Example Output: Yes

Example Input: Context: 
Utterance: 'Looking forward to this camping trip!  I am hoping we can find something amicable with these additional resources.'
Example Output: No

Example Input: Context: 'Most needed is both food and water. I guess food is my highest priority .🙂' 'Ok perfect, the item I need the most is water because I need to hydrate.  What do you think if I give you 2 food and I keep 2 of water. ' 'Ii understand , the problem  is ctheere is 3 of us. What if  we have 2 food and 2 water and you have 2 firewood ?🙂'
Utterance: 'The object I need the most is WATER, so I cannot give you 2, I am giving you 2 FOOD since it is what you most need. Remember that we must both be satisfied for this to work🙂'
Example Output:
Yes