Definition: 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, I am Nicole Garcia. 
 agent: Hello, how can I assist you? 
 customer: I would like to book a flight ticket to Austin to attend for a conference on 03/24 and I intend to return on 03/26. Please help me with booking a ticket. 
 agent: Sure, I am here to help you. Do you have any connection limit? 
 customer: Yes, I need a connecting flight. 
 agent: Can you please assign your airport codes? 
 customer: Its from CA-SFO to TX-AUS. 
 agent: Is there any price limit in booking a ticket? 
 customer: The ticket price should be under 200. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Sorry there is a no flight found on your required details. 
 customer: Fine, no problem. Thank you. 
 agent: Thanks for contacting us and have a great day.
Output:
no_flight