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: Please come in !
Person2:Hi . Steven . I just drop in and want to have a chat with you .
Person1: Oh , so nice of you to come here . Have a seat . Please make yourself at home .
Person2:OK . ( Sit on the sofa ) Wow ! Your house was decorated so beautiful .
Person1: Thank you . My wife would be very happy to hear this .
Person2:She must have done a lot of work on it .
Person1: You bet .
A:
informal