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 Input:
Context: 'Hi! What sort of packages are you looking for today?' 'Hi there! I am looking to have 3 packages of firewood, 2 packages of food, and 1 package of water please. ' 'Oh we have similar priorities 🙂I am also interested in getting firewood, because I have a condition that makes me very cold, colder than the average person, so I need to make sure I have enough for the trip. Why do you want food'
Utterance: 'That make sense. I need firewood though too because I have an autoimmune disease. When it flares up - when it gets too cold - I get very sick and have to go to the hospital. I need to make sure I have enough for the trip as well. I need food to keep my metabolism up so I can make sure my disease stays in check. Why do you want food?'

Ex Output:
Yes


Ex Input:
Context: 
Utterance: 'Hello 🙂 What do you need most??'

Ex Output:
Yes


Ex Input:
Context: 'Great! I get dehydrated very easily, so I am pretty jumpy at the thought of running out! 🙂' 'That's not good! ☹️ We don't want that to happen. So to confirm, you get 2 food and all the water, and I get 1 food and all the firewood? 🙂' 'Yes. I would get 2 food and 3 water, and you would get 1 food and 3 firewood. Hopefully this works for you!'
Utterance: 'You have yourself a deal!'

Ex Output:

No