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:       Good afternoon , sir . May I help you ? 
 Person2:I booked a table yesterday . 
 Person1:        What's your name , please ? 
 Person2:Smith . 
 Person1:        A minute , please . ... Yes , this way , please . 

formal