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: Can I help you ?
Person2:I'd like to buy a new mobile phone please .
Person1: Ok , would you like a phone with camera and MP3 player ?
Person2:Yes please . And I ' d like to be able to make video calls too .
A:
formal