Detailed 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
Problem:customer: Hello. 
 agent: Hello. 
 customer: I am Margaret Thompson. 
 agent: How may I aid you? 
 customer: I am planning to visit Central Park at New York, could you please help me with booking a flight ticket from SFO to EWR? 
 agent: Sure, I am here to help you. On which dates would you like me to book the flight? 
 customer: I would like to depart on May 14th and return on May 16th. 
 agent: Do you have any stopover in between journey? 
 customer: I need a connecting flight. 
 agent: Would you please help me with your specific depart and arrival timings? 
 customer: Make sure that my return time must be morning. 
 agent: Is there any class preference? 
 customer: I need a flight ticket in economy class. 
 agent: Thanks for providing details, we are unable to provide flights on your journey routes. 
 customer: Ok, not an issue. Anyways, thank you for the information. 
 agent: Thank you for opting us.
Solution:
no_flight