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: '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

Example Input: Context: 'I have a big party with varying degrees of health and I'm going to need every bit of firewood and food I can get my hands on!  🙂'
Utterance: 'hi, we may be in luck then, i really would like water as i enjoy walking and hiking, i will require some firewood though so i can roast some s'mores'
Example Output: No

Example Input: Context: 'You'll definitely need some additional calories if you want to do extra hiking.  I will give you all the additional food if you give me all the additional firewood. ' 'Sounds like a deal, maybe split the water packages evenly. Can't be dehyradated while camping 🙂' 'Agreed.  Your fun trip could turn into something quite dangerous without that hydration.  '
Utterance: 'Of course, that won't be fun. ☹️ So we have agreed'
Example Output:
No