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 have 3 kids with me who are always thirsty but we can negotiate for it' 'Ok. Thats fine' 'Oh great 🙂'
Utterance: 'There is really not much option of evenness since its an odd number package.'
Example Output: Yes

Example Input: Context: 
Utterance: 'Hello. I would like to take the following items. (2) Firewood, (2) Water, and Food (2)'
Example Output: No

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