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: 
Utterance: 'Hello there! I look forward to striking up a deal that's good for both of us. 🙂'
Example Output: Yes

Example Input: Context: 'Ok I'm sure we can work it out because I know I need extra water and firewood. Do you have any ideas on how to divvy up the extra supplies?' 'I would need some firewood as well, as I need it to cook the food. I was thinking maybe you can have all the water and I have all the food.' 'All the food is too much, I would need at least one package of the food for my group. I was thinking you could have 2 of the food packages and I have 1, then I get all the water and the majority of the firewood. That leaves you with 2 of the high priority food packages and a package of firewood to cook the food.'
Utterance: 'That seems quite unfair. I really would like my camping trip to be enjoyable.'
Example Output: Yes

Example Input: Context: 'Hello, I was hoping we can chat. ' 'Hi there. ' 'So why did you decide to come camping?🙂'
Utterance: 'I think it will be fun. I was wondering what your preferences are for the extra items we can bring?'
Example Output:
No