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:       Can you change American dollars into French francs ? 
 Person2:Yes . How much do you want ? 
 Person1:        Fifty dollars . What is the exchange rate today ? 
 Person2:One dollar to five francs . Is that all right ? 
 Person1:        Yes , please . And you can cash my traveler's check , can't you ? 
 Person2:Of course , we can . 
 Person1:        I want to be here tomorrow . What are your business hours ? 
 Person2:10 o'clock in the morning to 2 o'clock in the afternoon . 
 Person1:        Thank you . 
 Person2:Not at all . 

formal