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'.

Input: Consider Input: Person1: Good afternoon . I believe that this house is for sale .
Person2:That's right .
Person1: May I have a look at it please ?
Person2:Yes , of course . Come in .
Person1: How long have you lived here ?
Person2:I have lived here for twenty years .
Person1: Twenty years ! That's a long time .
Person2:Yes , I have been here since 1976 .
Person1: Then why do you want to sell it ?
Person2:Because I have just retired . I want to buy a small house in the country .
Person1: How much does this house cost ?
Person2:6850 pound .
Person1: That's a lot of money !
Person2:It's worth every penny of it .
Person1: Well , I like the house , but I can't decide yet . My wife must see it first .
Person2:Women always have the last word .

Output: informal

Input: Consider Input: Person1: Hi Mark .
Person2:Hi .
Person1: What are you planning to do today ?
Person2:I'm not sure yet .
Person1: Would you like to have lunch with me ?
Person2:Yes . When ?
Person1: Is 11:30 AM OK ?
Person2:Sorry , I didn't hear you . Can you say that again please ?
Person1: I said , 11:30 AM .
Person2:Oh , I'm busy then . Can we meet a little later ?
Person1: OK , how about 12:30 PM ?
Person2:OK . Where ?
Person1: How about Bill's Seafood Restaurant ?
Person2:Oh , Where is that ?
Person1: It's on 7th Street .
Person2:OK , I'll meet you there .

Output: informal

Input: Consider Input: Person1: I've come to say goodbye .
Person2:When do you leave ?
Person1: I'm catching the eleven o'clock train .
Person2:Take care of yourself and don't forget to keep in touch .
Person1: Goodbye . Hope to see you again next year .
Output: formal