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: Rachel has decided to quit smoking .
Person2:Really ? Why ?
Person1: You never guess she is going to have a baby .
Person2:Oh , it's unbelievable . She is such a chain smoker .
Person1: Yes , yes . She said she is going to stop drinking coffee too and quit all the unhealthy habits just for the baby .
Person2:Oh , she is going to be a great mother .
informal