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: Hi , Lander . What's wrong ?
Person2:I can hardly make ends meet these days .
Person1: Same here . I have't brought any new clothes for three months .
Person2:My income remains the same but prices just continue to rise .
Person1: True . The news says that there is a general increase in the price of daily necessities .
Person2:Definitely . I have to spend 300 yuan more on food every month .
Example Output: formal

Example Input: Person1: Hi , Jason !
Person2:Hi , Linda . I have two concert complimentary tickets . Will you go with me tonight ?
Person1: With the greatest pleasure ! Where is the concert held this evening ?
Person2:It will be held at the Central Music Hall .
Person1: What is on the program ?
Person2:It ' s a piano solo . I'm fond of piano , you know .
Person1: Hah ! OK . Let ' s go together !
Person2:Let ' s meet at the park at 6:00 .
Person1: See you then .
Example Output: informal

Example Input: Person1: Yo baby , are you satisfied with the costume show in the street ?
Person2:It ' s hard to say.Just so-so .
Example Output:
formal