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 aid you today? 
 customer: Please book a ticket from Seattle, WA-SEA to Houston, TX-IAH. 
 agent: Sure, we are here to help you. Kindly provide me your travel dates. 
 customer: Departure is by 06/23 and will return on 06/25. 
 agent: How much can you afford for this journey? 
 customer: I can afford up to 500. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: There is a flight with your requirement, airline is Delta with price 600. Shall I proceed with booking? 
 customer: Please do not book flight. 
 agent: Ok. May I know your name? 
 customer: I am Stephanie Baker. 
 agent: Thanks for reaching us. 
 customer: Thanks.
Output:
no_flight