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.

Context: 'Are you bringing guest?' 'I am a campaign partner' 'Oh. What does that mean?'
Utterance: 'No I am the only person who come with you'
No

Context: 'Hello there. I'd like to discuss making a deal.' 'yes, what would you like?' 'I was thinking I will take all the food and water. You can have the firewood. '
Utterance: 'that's not going to work for me. I need to keep at least 2 foods and 1 firewood but you can have all the water.'
Yes

Context: 'I agree! Nice to meet you... I have two boys who always eat! Any chance I canget 2 food?' 'Food is the item of greatest value to you?' 'It is! What do you think?'
Utterance: 'The item of greatest value to me is WATER. Before thinking about an offer I need to know what your priorities are and you need to know mine in order to conclude something fair for both of you.'

Yes