Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       What are we going to do ? I can't get the car out of this ditch . I'm stuck !  
 Person2:I'm worried , Tom . I haven't seen any other cars for almost an hour .  
 Person1:        I know . This is terrible . What can we do ? This snow doesn't stop falling !  
 Person2:I told you we should have stayed in town today.The weather report said 100 percent chance of snow.Why did you want to come up here ?  
 Person1:        I wanted to show you the cabin . We only had another half-hour to go .  
 Person2:Well , now we're stuck . What can we do ?  
 Person1:        I don't know .  
 Person2:I've heard that when this happens , it's important to save energy .  
 Person1:        What do you mean ?  
 Person2:We're stranded here , Tom . We may be here a long time.We need to conserve the gas in the car . The car's energy is what will keep us warm .  
 Person1:        I have plenty of gas .  
 Person2:Yes , but the gas and the battery both have to stay working.We can't just let the car run and run.If we do , it will die soon . Then we'll freeze .  
 Person1:        So what can we do ?  
 Person2:Turn the lights off.Then , run the car and the heater only about fifteen minutes every hour.That will conserve the heat as long as possible .  
 Person1:        Alright . That's a good idea .  
 Person2:I wish we hadn't come up here . Now we'll probably be here for days .  
 Person1:        Days ?  
 Person2:Yes , it happens.That is what happens in big snowstorms . People get stranded for days .  
 Person1:        Oh , my God ! It's good we have food .  
 Person2:Probably we'll survive.But turn the car off for about forty-five minutes . Then we'll turn it on again .  
 Person1:        Okay , I'll follow your advice . 

informal