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:       We've got a problem ... it looks like we'll need more spotlights on the exhibition booth . The client thinks it's too dark , and they want to add halogen lighting . We've already got 3 sets of track lighting from you guys , do you think you could help us out and throw in some halogens ?  
 Person2:Oh ... Um ... I don't think so . you know the halogen lighting is much more expensive than your track lighting system . Plus I'm going to have to call in some guys to install it for you . That's not going to come cheap .  
 Person1:        But it would only be adding to the existing structure . We're not talking about anything new here ...  
 Person2:It doesn't matter because we will still have to call the electrician out , and they are union labor . It'll cost you a pretty penny ...  
 Person1:        How much do you think it would cost ?  
 Person2:Mumm , I estimate it'll run in the neighborhood of ... $ 500 per light .  
 Person1:        $ 500per light ? ! That's ridiculous ! It can't possibly be that expansive !  
 Person2:It is , I'll tell you why . We'll have to call in the electrician , he's going to charge overtime now because it's already 5PM , and it will probably take him an hour a light . Plus , the halogen lights take more electricity , so your electrical cost is going to be higher as well .  
 Person1:        Can't you give me a break on this ? We've already spent so much money on lighting , I hate to have to blow so much more on halogens .  
 Person2:No , that's the cost , and that's what it's going to cost us . We can't go in the hole with this . I am giving you my best price , so take it , or leave it . 

informal