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: I'd like to meet you again sometime .
Person2:That would be great . Actually , can I get your phone number , Ella ? That's assuming you don't mind if I call you sometime .
Person1: Anytime . You can reach me at 5558929 .
Person2:Ok , got it . I will call you sometime next week .
Person1: Fine .
Person2:It's time to go . Bye , Ella . Hope to see you soon .
Person1: Bye , Jason .

Ex Output:
informal

Ex Input:
Person1: Hello , is this People's Theater ?
Person2:Yes , it is . May I help you ?
Person1: Yes , are advance tickets for ' Nut croakers ' still available ?
Person2:What date , sir ?
Person1: October 16th .
Person2:Let me see . Yes , we still have some tickets left . Which performance ?
Person1: 7:30 p . m . performance , please .
Person2:OK , we have tickets at 100 yuan and 50 yuan .
Person1: I'd like to reserve two seats at 100 yuan , please .
Person2:All right . May I have you name , please ?
Person1: Du Kun .
Person2:When would you like to collect the tickets ?
Person1: Tomorrow .
Person2:We can hold them until one day before the show .
Person1: How do we cancel , just in case ?
Person2:Just telephone us , and let us know in advance . We don't charge for cancellation .
Person1: All right , thank you very much . Good bye .
Person2:You are welcome . Goodbye .

Ex Output:
informal

Ex Input:
Person1: Well , humans could never make something like that .
Person2:Those poor Egyptians slaves worked so hard and you want to give aliens all the credit !
Person1: Be a little more open-minded , Stu ! Don't believe everything you read in your history books !
Person2:OK , but don't believe everything you see on The X-files , either !
Person1: Speaking of The X-files , it's on right now !

Ex Output:
informal