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: 'Interesting. Looks like we are in the same situation! 😮' 'I'd be willing to give you extra food if I could then get extra water and firewood. How about you Get 2 food, 1 water and 1 firewood?' 'That sounds almost fair. But I could possibly use 1 more firewood. What do you think?🙂🙂'
Utterance: 'Idk, you're already getting the extra food which would be important to me. I think my offer is very fair for both of us.'
Example Output: Yes

Example Input: Context: 'I know we need extra food too and some firewood. Maybe a little water but we shouldn't need too much' 'It sounds like we are looking for the same things. I think there are some extra we can share. Do you have an idea about how it can be the most fair? ' 'how about I'll give you 2 food if you give me 2 firewood and 2 of the water?'
Utterance: 'I think that is a fair deal! '
Example Output: Yes

Example Input: Context: 'hello' 'Hello there' 'how is your day going?'
Utterance: 'So far so good.  What are your plans for your camping trip?'
Example Output:
No