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, I am Richard Jones. 
 agent: Hello, how can I support you? 
 customer: Could you please help me with booking a flight to Seattle, SEA from New York, LGA? 
 agent: Sur, can you help me with your journey dates? 
 customer: I want to attend my sister's marriage, so you can book a ticket on 02/17 and return on 02/19. 
 agent: Sorry, no flights found on your given preferences. 
 customer: No problem, thank you for the information. 
 agent: Thank you for reaching us.
Solution:
no_flight