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 , is this the office of the Textile Corporation ? 
 Person2:Yes , What can I do for you ? 
 Person1:        I'm from CTC Trade Company . Here is my card . 
 Person2:Welcome to our corporation . I'm in charge of the export business . 
 Person1:        I'm glad to meet you here . You're Ms . ... 
 Person2:I'm In Hui . Do sit down , won't you ? 
 Person1:        Thank you , Ms . In . I'm here to discuss the possibility of establishing business relations with your corporation . 
 Person2:We'd be very glad to do so . Have you seen the exhibits displayed in the hall ? 
 Person1:        Yes , I had a look around yesterday . I wish I could have them all . Can you give me a price list with specifications ? 
 Person2:Yes , of course . If you make an inquiry , we can make you a firm offer . 
 Person1:        Thank you very much . 

formal