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 elicit-pref strategy, otherwise output No. elicit-pref is a cooperative negotiation strategy. It is used to discover the preference order of the opponent in the negotiation.

[EX Q]: Context: 'Hi there! How are you today?' 'Good!  How are you?' 'I'm doing well! Almost ready for my camping trip. Need some more supplies though.'
Utterance: 'Which supplies do you need?'
[EX A]: Yes

[EX Q]: Context: 'That's good to hear. I am going camping this weekend and need some extra supplies. What about you?' 'That's great! I also have a comping trip planned. We will be having an all night dance party. I could definitely use some extra supplies. What are you in need of the most?' 'That sounds like fun. I am pretty good at hunting and fishing, so I really don't need the extra food. I would like some extra firewood however. That would help cook the food and keep animals and insects away at night'
Utterance: 'Ugh ☹️ I too could really use the firewood. We need that campfire going all night to be able to socialize. How about water? Do you have enough? Do you need more?'
[EX A]: Yes

[EX Q]: Context: 'Let me give you 2 packages of water for 3 packages of food.' 'well, food is more valuable for me. what is your preference?' 'Looks like we both have a high value for food. I will give you 3 packages of water and you give me 3 packages of food.'
Utterance: 'What is your least preference?'
[EX A]:
Yes