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, what can I do for you at this time? 
 customer:  I am Kimberly Hill. I want to book a ticket to NY-LGA from TX-AUS. 
 agent: Sure, can I know your dates? 
 customer: My travelling dates are 09/23 and 09/25. 
 agent: Just hold on for a moment. 
 customer: Ok. 
 agent: Sorry for the inconvenience, there is no flight available on your dates. 
 customer: Ok, thank you for you response. 
 agent: Thank you for opting us.
Solution:
no_flight