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. 
 agent: Hello. How can I assist you today? 
 customer: I'm Nancy Green here. I want to travel for a city roundup trip at Washington, can you please book a ticket from DC-IAD to DC-DCA? 
 agent: Sure, can you share your probable travelling dates? 
 customer: Sure, my preferable dates of journey are from 10/05 to 10/07. 
 agent: Please allow me a moment to check for the availability of flight. 
 customer: Sure, please make sure that price is 200. 
 agent: Sure. Nancy, I am sorry to inform you that there is no flight available at your requested dates. 
 customer: Ok, fine. Thank you for your service. 
 agent: You are welcome. Thank you for contacting us.
Output:
no_flight