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: 'one food, three wood.' 'bro it is not a fair deal give me 2 food, one firewood 2 water' 'if you think I am not being fair can I have what you are asking for?'
Utterance: 'you told me i not fair that why i told you are not fare,3 food for me  will give 3 firewood for me, give 2 water for me, other we can end the deal and both we can forget the bonus'
Example Output: Yes

Example Input: Context: 'hello' 'hi'
Utterance: 'In this extra package I need two food'
Example Output: No

Example Input: Context: 
Utterance: 'Hello there?'
Example Output:
No