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 Sharon Gonzalez. 
 agent: Hello, how may I amend you today? 
 customer: I want to head to Austin to book a car at auto expo, can you help me to book a flight ticket? 
 agent: Sure, may I know your journey dates? 
 customer: Sure, my planned journey dates are 07/02 to 07/04. 
 agent: Could you please help me with providing your corresponding airport codes? 
 customer: Sure, my airport codes are DFW to AUS. 
 agent: How much you can afford for ticket fare? 
 customer: My budget is 500. 
 agent: Thanks for your details, we found a direct flight to your destination. 
 customer: Do not proceed for booking, I need a halt. 
 agent: Ok. 
 customer: Thank you. 
 agent: Thank you for opting us.
Solution:
no_flight