TASK DEFINITION: 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.
PROBLEM: Context: 
Utterance: 'Hi!  The weather is going to be a lot colder than I anticipated, so I need extra firewood.  Would you be willing to give some to me?'

SOLUTION: Yes

PROBLEM: Context: 'Same! I'm a little worried about some of my supplies though. What about you?' 'Likewise! What are you most in need of?' 'Well, I'm camping up on a snowy mountain and I gave some of my food away to hikers who were passing me and were very tired and hungry, so I'd really like to get some more food. Firewood would be useful too, although I do have a thick coat and a sleeping bag. I plan on melting the snow to get water, so I don't think I'll need that too much. And you?'
Utterance: 'I have the same needs. I have a low metabolism, so I need food and firewood to keep me warm and energized. Water I plan on filtering elsewhere.'

SOLUTION: Yes

PROBLEM: Context: 'I have some stuff, but I really need a decent amount of firewood. Gets really cold at night where we camp' 'I am fine with the cold although I might need some to set up the fire. I have a baby with me so I might need to heat up the milk or food. ' 'Oh, I see. How about 2 firewood for you and 2 food. I keep the rest'
Utterance: 'I don't really need food. I can do it with 1 firewood so you can get the rest. But I really need water. We are going hiking and drink a lot.'

SOLUTION:
Yes