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: 'I understand your preferences. If I take all of the water, 1 firewood, and 2 food your family will still have the opportunity to have a good camping trip and I can learn to survive on this trip. Please consider my request again.☹️' 'Ok - you're not being reasonable at all.  If you're so incompetent at going camping, maybe you should stay home and I can take all the supplies. How's that for an excellent offer?  All for me and 0 for you.' 'I think it would be good to come to a compromise. If I take all of the water and have the 2 foods, you can take all of the firewood as you originally proposed. Yet, I will have a tough time learning how to survive on a camping trip.😡'
Utterance: 'Again, that's not a fair compromise....You get all of what we both we want and more of another item.  Let me state it to you clearly so you can understand.  I WILL NOT ACCEPT THAT OFFER.  There is no chance you are getting all the water now that I think about it.  I will offer I get 1 water, 2 firewood, and 2 food.  If you can't come up with a reasonable offer, I will just walk away and we both get nothing.  I will survive because I will have skills.'
Example Output: Yes

Example Input: Context: 'hello' 'Hello, there. Should we discuss how to divide up the items for the camping trip?' 'yeah. i need 2 firewood, 1 water and 1 food'
Utterance: 'I need to have 2 or 3 pieces of firewood because I did not pack any way to heat up my food without firewood.'
Example Output: No

Example Input: Context: 'no i need firewood to always keep myself warm.' 'So do I, I have health issues.  I can give you one firewood, if I get all the food. ' 'why can't i get 2 firewoods?.......i'm an ulcer patient i need more than enough food to keep fit''
Utterance: 'It will be a strain, but I can give you 2 firewood if I get all the food and two water.'
Example Output:
No