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 I draw my tax back here ? 
 Person2:Sure . Show me your receipt , please . 
 Person1:        Here you are . 
 Person2:Wait a moment . Here is $ 10 you paid for duties . 

formal