Detailed Instructions: 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'.
Q:  Person1:       Do you like to dance ? 
 Person2:Sometimes , if there's music playing . 
 Person1:        What kind of dancing do you like ? 
 Person2:It all depends . If it's rock music I'll do disco , and if it's romantic music I'll do ballet . 
A:
formal