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: Excuse me , sir .
Person2:What's the matter ?
Person1: I heard that we will call at some ports on the way . Is that true ?
Person2:Yes .
Person1: Where will we call at ?
Person2:Dalian .
Person1: Dalian is my hometown .
Person2:Really ?
Person1: Can I get off the ship and walk around ?
Person2:Sorry . I'm afraid you couldn't .
Example Output: informal

Example Input: Person1: Are you coming or not ?
Person2:I haven't decided yet .
Person1: Well , make up your mind . We need to know .
Person2:Ok , count me in .
Example Output: formal

Example Input: Person1: May doesn't get along very well with her mother-in-law .
Person2:Yeah . That's just what is troubling John .
Person1: Poor John ! He is bettering bother sides of this bread .
Person2:This situation isn't easy to handle .
Example Output:
informal