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: 'Hello there 🙂' 'Hello, I hope we can work together on an offer that benefits both of us. Do you think it's OK?🙂'
Utterance: 'Yes definitely!  I am pretty easy to work with and would like a deal that will help us both out as much as possible.'
Example Output: Yes

Example Input: Context: 'Hi! How are you?' 'I am fine. How is your camping trip going?' 'I'm just finishing the final details of packing. I'm a little concerned I don't have enough of a few things. It is supposed to be over 100 degrees where we are going, and I don't think I have enough water. I'm concerned my kids are going to get dehydrated. I really could use 3 extra packages. '
Utterance: 'That will not be possible i am afraid. I need at least 2 packages of water too. I have some tabs that i have to take with water regularly.'
Example Output: Yes

Example Input: Context: 'Alright fair enough, let me have 3 on food, 1 on firewood and 1 on water. This trip means alot to me' 'i can do that for you, in on a diet anyways and already have a stock ive been working on since fall' 'oh well that's fantastic, so let me know what your deal is'
Utterance: ' 3 on food, 1 on firewood and 1 on water😮'
Example Output:
No