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:       Excuse me . Do you know where I can find a pay phone ? 
 Person2:There is one around the corner . 
 Person1:        Can I make an international call from that pay phone ? 
 Person2:Yes , but you have to get a phone card first . 
 Person1:        Where can I get a phone card ? 
 Person2:You can get one in the grocery store over there . 
 Person1:        Oh , I see it . Thank you . 

informal