Given the task definition and input, reply with output. 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: Hi . What's up ?
Person2:Nothing much . What's new with you ?
Person1: Not too much . I've been pretty busy .
Person2:Me too . Seems like all I do is eat and sleep .
Person1: Gotta go . Call me tonight .
Person2:Okay . Check you later .
formal