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: 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 .

Output: informal

Input: Consider Input: Person1: So , what happened ?
Person2:He never came .
Person1: He stood you up .
Person2:I wouldn ' t exactly characterize it in that way . I think something happened . Something terrible and unexpected that made it impossible for him to ... what if he showed up , took one look at me and left ?
Person1: Not possible .
Person2:Maybe , there was a subway accident .
Person1: Absolutely .
Person2:A train got trapped underground with him inside .
Person1: And no phone .
Person2:And you know , how those express trains create suction .

Output: informal

Input: Consider Input: Person1: Where do you usually do your shopping , Mrs . Lane ?
Person2:I usually go to the supermarket , near the station .
Person1: How do you find the prices there ?
Person2:I think they are quite reasonable , and the vegetables are very fresh .
Person1: I see you have bought some coffee . Would you mind telling me how much you paid for it ?
Person2:Only 2 dollars and 25 cents .
Output: formal