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:       Come on.Plenty of room upstairs.Fares please !  
 Person2:One to the beach . How much is it ?  
 Person1:        One dollar ... I'm short of change this morning .  
 Person2:Sorry . I can wait a moment .  
 Person1:        Good , here's your ticket and four dollars change .  
 Person2:Thank you . 

informal