You will be given a definition of a task first, then some input of the task.
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: Beautiful weather , isn ' t it ?
Person2:Yes , it is . Are you here on business ?
Person1: No , I ' m on a vacation to see the famous Three Gorges .
Person2:I ' m going there for a tour , too . Is this your first trip to China ?
Person1: Yes , it is .
Person2:Why don ' t we go together ? I can show you around . I think you ' ll have a better time .
Person1: I couldn ' t agree more .
Person2:Great , let ' s go !
Output:
informal