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. If the conversation begins with a question, label it '1' otherwise '0'.

Person1: Switchboard . Which extension would you like ?
Person2: Extension 1616 , please .
Person1: I'm afraid the line is busy at the moment . Just hold on , please .
Person2: Then , will you try extension 235 ?
Person1: Certainty , sir .
1