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:       Pam , where's the closest ATM ?  
 Person2:It's not that far . Do you see that Yellow building over there ?  
 Person1:        The big one or the small one ?  
 Person2:The big one .  
 Person1:        Yes .  
 Person2:It's right next to it , on the right .  
 Person1:        Do you know if there's a convenience store around here ?  
 Person2:I don't think there's one around here . The closest one is on 3rd street , but that's probably closed now .  
 Person1:        I really need to get some things before I leave .  
 Person2:Well , you could go down to 22nd street . There are lot of stores down there that are open 24 hours a day .  
 Person1:        Can I take the subway to get there ?  
 Person2:Yes , but that'll probably take about half an hour . You should just take a cab .  
 Person1:        Won't that be expensive ?  
 Person2:No , from here I think it's only about 5 dollars . 

formal