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.

Example Input: Context: 'Hi! How are you?! You excited for your camping trip??! I sure am ready to go on mine!' 'I am very excited, I'm actually going camping in a week. I drink a lot of water so it's important that I bring a lot. What about you?' 'I really am! I have been watching the weather and updates about the area I will be traveling to. They are experiencing a severe drought, so I will be in need of some extra water as well! I planned on staying an extra couple days as well. There is a stream nearby I believe, but I'm not sure how much it has dried up.'
Utterance: 'That's good to hear, you always have to be careful with wild water though, it has all kind of germs. Sounds like you'll have plenty of dry firewood though. '
Example Output: No

Example Input: Context: 'Hey! I'd like some more firewood to keep my doggo warm. What do you need?' 'I need firewood as well. We have a large group consisting of mostly senior citizens, including my grandma, so we'd like the firewood to keep everyone warm.' 'I see. 😮 What are you least interested in?'
Utterance: 'We can make do without extra water. Can we trade two waters for an extra firewood package and an extra food package?'
Example Output: No

Example Input: Context: 'Do you have any preferences in regards to the firewood, food, and water? I would like us both to get what we need.' 'I get really cold at night so I'd like to have extra firewood. ' 'Same. Plus I am planning on keeping a fire long into the night. Eating alot of food also helps keep you warm while sleeping. Perhaps I could offer you some extra food in return for some extra firewood?'
Utterance: 'Hmm I will have to think about this offer. How do you feel about the water packages?'
Example Output:
Yes