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: 'Oh no, I'm so sorry to hear that ☹️ Let me ask about the food first then, would you be willing to give me the 3 packages of that? I am going to have a lot of people with me and we won't be near any stores at all.' 'if i give you all the food items, will you give me the firewood?' 'I was thinking maybe you can have 2 firewood and 3 waters. And I could take 1 firewood and 3 food?'
Utterance: 'that sounds fair'
Example Output: Yes

Example Input: Context: 'I want a lot of water my friend. I will be hiking and what I hav is not enough' 'ok, but i want 2 pack of food, 2 pack of water and 1 pack of firewood' 'I also want 2 water. Then I can take 1 from the other items.'
Utterance: 'ok fine '
Example Output: No

Example Input: Context: 
Utterance: 'hello, how are you today?'
Example Output:
No