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 , when is the next train to Los Angeles ?  
 Person2:10:15 a . m .  
 Person1:        Can I get the ticket here ?  
 Person2:Sorry . You have to buy your ticket at the next counter .  
 Person1:        Thank you . 

informal