Instructions: In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details
Input: customer: Hi. 
 agent: Hello, how may I assist you today? 
 customer: I need to reach New York to explore new things about Statue of Liberty, can you help me to book a connecting flight? 
 agent: Sure, can you please share your journey dates? 
 customer: Sure, I intend to start on 04/02 and my return date will be on 04/04. 
 agent: Kindly mention your airport codes? 
 customer: My boarding and landing airport code are DTW and JFK. 
 agent: Do you have any other specifications to be met? 
 customer: No, please proceed. 
 agent: Can I have your name to proceed further? 
 customer: I am Nancy Jackson. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Thank you for your valuable time, unfortunately no flights available on that route. 
 customer: That's ok, not an issue. Thank you for your information. 
 agent: Thank you for opting us.
Output:
no_flight