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: Are you Elvin ?
Person2:Elvin Dixon . Who are you ?
Person1: I'm Mary . I want to say I really admire the software you're designed .
Person2:Easy stuff . But thanks . And the admiration is mutual .
Person1: It is ?
Person2:You're selling invoking subscriptions like nobody's business . And we don't even have a working demo yet .
Person1: I can't take the credit for that . I'm just Zina's assistant . She's the pro .
Solution:
informal