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 , 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: When can we expect you and your daughter for dinner ? Next Saturday ?
Person2:Next Saturday ? I ' m sorry . I ' Ve promised to go to a Chinese Opera with my daughter .
Person1: How about Sunday then ?
Person2:Yes , Sunday sounds fine . What time ?
Person1: Does 6 thirty suit you ?
Person2:It suits us fine . We ' ll see you then .
Person1: Thanks , goodbye .
Example Output: informal

Example Input: Person1: Hello , Rachel . It's glad to see you here .
Person2:Hi , Ross . Glad to see you , too .
Person1: I'm going to throw a party tomorrow night . Would you like to come ?
Person2:A party ? Yes . I'd love to . Thank you for inviting me . Will Monica come ?
Person1: Of course .
Person2:That's great ! What time will it start at ?
Person1: At 6 o'clock .
Person2:OK . I'll come . See you then .
Person1: See you .
Example Output:
informal