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: 'Well fortunately if you are camping that won't be too bad. You'll blend in with the wilderness.' 'My friends will run away. I will not be comfortable either. So how do we split what we have?' 'If they're true friends, they won't. I'll take 2 firewood, 2 water, 3 food.'
Utterance: 'That is very unfair ☹️'
Example Output: Yes

Example Input: Context: 'Hello, I'm in a strong need for food and water. Please let me have a few packages of food and water. I'd gladly trade all my firewood for it.'
Utterance: 'Hello. Wow! That does not sound good. My sister just called and let me know she will be coming tonight. She is bringing food so i have plenty to share. 🙂'
Example Output: No

Example Input: Context: 'Do you have a deal to offer?' 'I would like 2 firewood, and I don't care about anything else. I would give you 2 water and 3 food' 'I will give you 1 firewood for 3 waters and 3 foods. '
Utterance: 'Nah I'll pass'
Example Output:
Yes