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: I'm going to America .
Person2:Any idea when you'll leave ?
Person1: I hope before the end of the month .
Person2:Let me know when you find out .
Example Output: formal

Example Input: Person1: Hello , can I speak to Alice , please ?
Person2:Hold on , please .
Person1: Thank you .
Person2:Sorry , but she ' s out .
Person1: Could you tell her Tom Green called ?
Person2:I ' d be glad to .
Example Output: informal

Example Input: Person1: Hello .
Person2:Hi .
Person1: How are you ?
Person2:I'm good . How are you ?
Person1: Good . Do you speak English ?
Person2:A little . Are you American ?
Person1: Yes .
Person2:Where are you from ?
Person1: I'm from California .
Person2:Nice to meet you .
Person1: Nice to meet you too .
Example Output:
formal