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: I'm quite upset ! I want a new room and a refund for tonight .
Person2:Forgive me , sir , I haven't been told what the problem is .
Person1: I'm about to be swept away by millions of cockroaches !
Person2:My apologies , sir . We'll transfer you to a new room at once and give you a full refund .
Person1: Thank you . I didn't want to have to take this to court .
Person2:Sir , we never want a guest to stay here mad or unhappy .
Example Output: informal

Example Input: Person1: Excuse me , can you recommend some places for us to go tonight ?
Person2:Since it's your first time to Vienna , I think you should go to the concert .
Person1: Good idea . My wife has a fine ear for music . I am sure she would like it .
Person2:Have a nice evening .
Example Output: formal

Example Input: Person1: She's pretty and meek .
Person2:No , I can't agree with you . She's one but not the other .
Person1: What makes you think so ?
Person2:She's my wife , you know .
Example Output:
informal