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'.

Example Input: Person1: What is the weather like today ?
Person2:It stops snowing , but there's a bit wind .
Person1: And the streets are covered with ice . Do you know what the temperature is today ?
Person2:I missed today's weather for cast in the radio
Person1: It seems 10 degree below zero at least . I don't mind the cold weather , but do hate when it get slippery .
Person2:The ice is soon be thick for skating . I'm so fine to want a sport
Person1: That's fine . let's go skating together tomorrow .
Example Output: formal

Example Input: Person1: Congratulations ! Is it a boy or a girl ?
Person2:It's a boy .
Example Output: informal

Example Input: Person1: What a washing machine ! It ' s getting worse today . Look ! Now it doesn ' t work at all . I think I need a new one .
Person2:Here ' s an ad . about a big sale of washing machine . Do you want to see it ?
Person1: Of course ! Let ' s have a look . Great ! In my frame of mind , I ' d like to buy one today .
Example Output:
informal