Definition: 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'.
Input: Person1: Welcome . How can we be of service today ?
Person2:Hello . My aunt in the US has sent me $ 500 . She sent it yesterday , using the standard service . It's my birthday today , you see .
Person1: Well , happy birthday . If it was sent yesterday using the usual service , it should be here already . You do have an account with us , right ?
Person2:Yes . Here's my card . Do you need my ID ?
Person1: Please . Just to double check all the details .
Person2:There you go .
Output:
informal