You will be given a definition of a task first, then some input of the task.
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'.

Person1: How many people are there in your family ?
Person2:Five.My father , mother , brother , sister-in-law and me .
Person1: Is your brother older or younger than you ?
Person2:He is five years older than me , He got married last Sunday.My brother and my sister-in-law are the same age .
Output:
formal