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: 'I really need water because I take medication that requires drinking a lot of water. The firewood I dont need to much off and I need very little food as I am dieting. lol 🙂' 'I totally understand that. And it's pretty important, lol ' 'It sure is..So how much food do you need for the trip? Do you need firewood to cook the food? Thank you for understanding my issues. 🙂'
Utterance: 'I definitely need the food the most. I'm definitely not a "hunter", so if I were to run out, I'd be in pretty sad shape. I do need the firewood for both cooking, and keeping warm. It gets cold at night where we're going. How about youself?'
[A]: Yes


[Q]: Context: 'Definitely! I am glad we could come to an agreement. Do you like to camp a lot? Or hike?' 'I love to camp! Especially when there is enough firewood! It is a great (and inexpensive) activity for me I get a lot of enjoyment out of. Hopefully you will become an avid camper after this trip!' 'Haha maybe! I am afraid of some bugs though, especially ticks 😮'
Utterance: 'Yes, you have to check EVERYWHERE for ticks! And since we've come to an agreement, I will submit our deal!'
[A]: No


[Q]: Context: 
Utterance: 'Hi, I'd like 3 packages of food. I have diabetes and my blood sugar could drop.'
[A]:
No