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: Hello. I am Kimberly Jones. 
 agent: Hello,. How can I amend you today? 
 customer: I am planning to visit the Neon Museum in Las Vegas, could you please help me in booking a flight ticket? 
 agent: Sure, we are glad to aid you. May I know your airport codes? 
 customer: My source is Dallas, TX - DFW and destination code is NV - LAS. 
 agent: When did you schedule your trip? 
 customer: I want to fly on 05/07 and return on 05/09. 
 agent: Please, wait for a while I will check the availability of flights and revert to you. 
 customer: Sure. 
 agent: Thanks for your time. There is no flight found to your route based on your request. 
 customer: Not an issue. Thank you. 
 agent: Thank you for reaching us.
Output:
no_flight