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'.

Ex Input:
Person1: Would you like to come out with me tonight ?
Person2:Sorry , I can ' t .
Person1: Tomorrow night , then ?
Person2:I ' d like to . But I ' m afraid I can ' t .
Person1: I was wondering if you like to go to the theatre then .
Person2:That sounds great .
Person1: Ok . How about give me a ring , then ?
Person2:No . I ' d better not .
Person1: Why not ?
Person2:Because I don ' t think my husband would like it . Thank you for inviting me anyway .

Ex Output:
formal

Ex Input:
Person1: I haven ' t met Bob for years . How is he ?
Person2:He has been keeping bach after divorce .
Person1: He would have recovered from the stress and got married again .
Person2:Once bitten , twice shy . He said he would rather keep bach than to live in disgust .

Ex Output:
formal

Ex Input:
Person1: Hello , I'd like to subscribe to a magazine .
Person2:What magazine do you want to subscribe for ?
Person1: Fitness Consultant .
Person2:OK , Fitness Consultant . How many subscriptions do you want ?
Person1: Only one , please .
Person2:How long do you want the subscription for ?
Person1: For six months , please .
Person2:Your name , please ?
Person1: Shirley , that's my wife's name . I subscribe to this magazine for her .
Person2:I see . Please put your address here then .
Person1: OK . How much is the subscription ?
Person2:650 Yuan .
Person1: 650 Yuan ! You must be kidding ! I can subscribe for evening newspapers for ten years with that much !

Ex Output:
informal