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 am just going to walk away,  I can't have my family freeze' 'I do not want my family to freeze either but walking away doesn't benefit either of us. How about I take the water and 2 firewoods, you have the rest' 'No deal, I need at least 2 firewood'
Utterance: 'Ok, I can agree to 2 firewood but I will have to take all the food and water to compensate'
Example Output: Yes

Example Input: Context: 
Utterance: 'Hey there how are you?'
Example Output: No

Example Input: Context: 'Okay, so you can take all the firewood and I take all the food. I will also need at least two waters because I had a limited supply at home.🙂' 'no, i will need 2 water because i need to drink it and there not much water around me' 'Please work with me. I will need plenty water to make it to the top of the mountain.'
Utterance: 'i am already giving you all 3 food which i also need to eat'
Example Output:
Yes