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: Is there anything I can do for you ?
Person2:I want a chemise .
Person1: You have really good taste . It's the best seller right now .
Person2:Could I try it on ?
Person1: Sure .
Person2:Well . It's not my taste . Would you please bring me a short sleeve ?
formal