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:       How did you get around over there ? Did you rent cars ?  
 Person2:No , that would be too expensive . We used the train system.We bought a special pass called a Enrail pass . It lets people use the train wherever they want , as often as they want .  
 Person1:        I've heard about Enrail passes.So those Europeans really depend on trains a lot .  
 Person2:Yes , they do . I wish we Americans had a better train system .  
 Person1:        I know . Our train system is lousy.And besides , Americans love their cars too much .  
 Person2:I agree . And probably the automobile companies are too powerful.They never allowed the government to develop trains .  
 Person1:        It's too bad for the environment . So much pollution from cars .  
 Person2:Americans love cars for different reasons , I think.One reason is that we are very individualistic.And cars are a very individual way of getting around.Americans like the freedom of driving around by themselves.They don't want to ride in a train or bus with a group of people .  
 Person1:        Yes , I agree . I think it is a cultural characteristic.It would be very hard to get us Americans to change this.But you know what ? Probably , in the future , Americans will have to change .  
 Person2:Why do you say " have to " ?  
 Person1:        Because the earth's environment can't tolerate cars forever . I think cars are already causing global warming.When the problem gets more serious , world governments will have to start limiting car use .  
 Person2:Maybe you're right . They will have to develop alternative transportation.But it will be hard in America . Too many people are used to cars.Even in our movies cars are very important .  
 Person1:        Wow ! I didn't notice the time.It ' s almost noon . I have to get home .  
 Person2:Do you want me to give you a ride ?  
 Person1:        No , no problem . I have my car in the parking ramp around the corner .  
 Person2:Alright.Well , I'll stay here and have another coffee . Nice running into you .  
 Person1:        See you around . 

formal