Detailed Instructions: 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'.
Problem: 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 .
Solution:
formal