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 self-need strategy, otherwise output No. self-need is a selfish negotiation strategy. It is used to create a personal need for an item in the negotiation, such as by pointing out that the participant sweats a lot to show preference towards water packages.

Ex Input:
Context: 
Utterance: 'Hello, what is your preference for supplies?  I would prefer to have as much extra firewood as possible, but am relatively indifferent to the rest.'

Ex Output:
Yes


Ex Input:
Context: 'Hi I am also going camping. Unfortunately I need as much firewood and water as possible too. I need to be able to cook our food and stay warm all night ' 'Can I ask how many people are camping with you? Are you planning on hiking the mountain?' 'Oh yes, I have my whole family coming. I'm really excited because we don't see each other often. My aunts, uncles, cousins. Some of us will hike while others stay back. Maybe we can come to an agreement? Will you also be hiking?'
Utterance: 'Yes hiking for sure.  If I take 2 firewoods and give you 2 waters and 1 food, would that be acceptable?'

Ex Output:
No


Ex Input:
Context: 'I would be interested in firewood.  Can I ask you, what are your primary concerns on this trip?' 'My primary concerns are staying hydrated, I have been feeling sick and throwing up from being so high up in the mountains. ' 'Oh, so sorry to hear that.  I can understand why water would be important to you.  I am worried about being too cold at night. My sleeping bag is not rated well for cold weather (I packed the wring one).'
Utterance: 'Oh I understand that for sure. I am not used to the cold weather either which is not helping. Would you be interested in a trade for water in exchange for firewood? '

Ex Output:

Yes