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.

Ex Input:
Context: 'I'm doing well. I'm very excited about our camping trip!' 'I am too! I have a rather large family and we are looking forward to getting out for some time away!' 'How nice. I am bringing my daughter and her girl scout troop. I am the co leader.'
Utterance: 'Oh that'

Ex Output:
No


Ex Input:
Context: 'I would like a little extra food for myself as well. Would you be willing to split the food 1 for me and 2 for you? ' 'I'd be willing to do that if you gave me some water and firewood in exchange' 'How about I keep 2 firewood, you take 1? What do you propose for the water?'
Utterance: '1 food for 1 firewood isn't a good trade for me. I would need at least 1 firewood and 1 water to trade for 1 food.'

Ex Output:
Yes


Ex Input:
Context: 'Thank you, 2 packages of firewood would work.' 'So could I get 2 food, if you get 1 food?' 'How many persons are you feeding? I am feeding 2 adults and 2 children.'
Utterance: '2 adults and 3 children, so if I get 2 food and 1 water, you could get 1 food and 2 water? '

Ex Output:

No