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: 'Hi there! How are you?' 'Hello good morning I'm well thank you.'
Utterance: 'Let's talk about what we need. First, I don't eat meat, so I really feel like I'd need a little extra food, as I couldn't hunt or forage for food at all. I feel like I could survive without a ton of water, but would need water, as I hike a lot and cant trust any sources'
Example Output: No

Example Input: Context: 'Zero water is not going to work 😮. I am willing to switch water and firewood amounts so that I get 2 firewood and 1 water and you get 2 water and 1 firewood. ' 'Alright. But than I will need at least 1 food than. So it would be 2 water for me 1 for you, 1 food for me 2 for you and 1 firewood for me and 2 for you. 🙂' 'I think that sounds ok, I will make that deal with you whenever we can go through with it. 🙂'
Utterance: 'Smashing🙂 Sounds good with me. Happy to get it all sorted out. cheers'
Example Output: No

Example Input: Context: 'Well, that's a bummer. How are you set for food? While I wouldn't mind a bit more, I'm in pretty good shape there, so I'd be willing to trade it for water. I'd hate to leave without getting a good hike in.' 'Hun,It's a bit of a fair deal,but due to the condition here i will need a bit more of water though foo cannot be overlooked also for survival but still to survive we take chances.So do you mind me giving you a package of food and u trading 2 pakages of water?.' 'Well, I tell you what, I'd be willing to take 2 packages of water and 2 of firewood and leave the rest to you, including all of the food. How does that sound?🙂'
Utterance: 'ok nice good deal'
Example Output:
No