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, Jason hill here. 
 agent: Hello. 
 customer: I need to book a flight ticket to New York to enjoy music festivals with family. 
 agent: How can I help you? Can you please share your dates of travelling? 
 customer: My travel dates are 05/21 and 05/23. 
 agent: May I know price limit? 
 customer: I need a direct  flight within range of 1000. 
 agent: Can I have your airport codes? 
 customer: I will depart from CA-OAK to NY-LGA. 
 agent: Please wait. 
 customer: Ok. 
 agent: Thanks for your time, sorry, no flights found on that day. 
 customer: Ok, thank you. 
 agent: Thank you for picking us.
Output:
no_flight