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.

[Q]: Context: 'Hello! I am looking forward to the camping trip but could use a few more supplies!' 'hello, me too, i guess we can share'
Utterance: 'Sounds good, I need food the most, what is your most needed item?'
[A]: Yes


[Q]: Context: 'I may be able to do something with regards to food. Do you have enough water?' 'I have more water than I need. How is your water supply?' 'I could use some more water as I get dehydrated easily. Since you have enough, I could give you and extra package of food for your water.'
Utterance: 'That sounds like a deal, what would you like to do as far as the firewood goes?'
[A]: No


[Q]: Context: 
Utterance: 'Hello 🙂 What do you need most??'
[A]:
Yes