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:       Are you sure that this is the place to wait for our school bus ?  
 Person2:Yeah . Look , other kids are coming this way .  
 Person1:        But it doesn't look like a real bus stop .  
 Person2:That's because regular buses don't stop here .  
 Person1:        How much is it going to cost ?  
 Person2:Nothing . It's free .  
 Person1:        Is that yellow bus it ?  
 Person2:Let's go sit in the back . All the cool kids do . 

informal