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'.

Person1: Do you know Yahoo Greetings , Edgar ?
Person2:Sure . It's a popular e-card website .
Person1: Can you tell me how to send one on it ?
Person2:Okay . Did you get the Yahoo ID ?
Person1: ID ? What's that ?
Person2:I mean , you must register first before you send a card .
Person1: Oh . I see . But I have done it .
Person2:Ok . Choose the card which you like best , and fill in the following blanks with both your and your friend's names and e-mail addresses .
Person1: Is that all ?
Person2:Don't forget to send .
Person1: Oh . I see . Thanks .
informal