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'.
Q: Person1: What is the matter with you ?
Person2:I've got a sore throat and my chest hurts .
Person1: How long have you been like this ?
Person2:It has been two or three days .
Person1: I think you've got a flu.Take this prescription to the chemist's and then go back and sleep .
Person2:Thank you very much .
Person1: Don't worry about your flu . You will be OK soon .
Person2:Thank you .
A:
formal