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 . Can I ask you a question ? 
 Person2:Sure . What is it ? 
 Person1:        I don't know how to say it in English . 
 Person2:We call this a ' parking meter ' . 
 Person1:        Oh , Thank you . But how do you spell it ? 
 Person2:P-a-r-k-i-n-g m-e-t-e-r . 

formal