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.

Context: 
Utterance: 'Hello, I will start out by saying that I would like to have 3 water because I do not have a nearby water source. What is your situation?'
Yes

Context: 'Hello! I'll be camping soon and need to get my hands on some supplies. The food is what I need the most.' 'I'm glad you are joining the camp! I will be bringing my girl scout troop for some badge earning opportunities.' 'Oh my. A whole troop of girl scouts will probably be bringing lots of food with them to share, and plenty of people around to collect firewood. It is going to be just me and my son on this camping trip, his first time.'
Utterance: 'We were planning on getting our outdoor cooking badge by making  a big meal over the campfire tonight. I wll need plenty of firewood for that, but I can manage with only one food.'
No

Context: 'Hi, I am great 🙂 How are you? I would be happy for you to have two waters if I can have one. I would also like to have three things of food. I love cooking outside, so I would love to make large delicious meals for my group to enjoy' 'That sounds amazing and delicious! maybe we can compromise? Maybe, I can get all 3 waters and you can have all 3 Foods? what do you think? ' ' I would agree to that if I can also have two things of firewood. I am going to need a lot of wood, so I can cook the meals I am making 🙂'
Utterance: 'I completely understand, thank you for compromising with water and food. Wished we had 4 firewoods to divide and share it equaly, may I ask how long will you be camping for? Im afraid I need 2 firewoods as well, maybe we can see who has the greater need? '

No