Definition: 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'.
Input: Person1: Are you interested in mountaineering ?
Person2:Yes . in some sense . I should say I like mountain climbing , you know , because I'm not so professional . How about you ?
Person1: I'm the same with you , an amateur mountain climber . 1 went climbing in the Rocky Mountains with my friends last summer vacation . We spent two days in the mountains .
Person2:How did you spend the night there ?
Person1: We pitched a tent in the night , waiting for the sunrise . Wow ! It was too beautiful .
Person2:I had a similar experience , but that was on the top of Tasha Mountain in my country .
Person1: Tasha Mountain ? It's very famous in China , isn't it ?
Person2:Yes.It IS one of the Five Mountains .
Person1: I want to climb Tasha Mountain this summer vacation . Would you be my guide ?
Person2:I'd love to .
Output:
informal