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: It seldom rains this summer .
Person2:Yeah , some places are very short of water .
Person1: Because of pollution and other things , our environment has become worse and worse .
Person2:You see , . This time I traveled to the West . When I looked out of the windows of the rain , all the lands that I could see are as dry as a bone .
Person1: It is serious .
A:
informal