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
Input: customer: Hello, I am Patrick Lopez from Washington. 
 agent: Hello, how may I serve you today? 
 customer: I want to book a flight ticket to Houston, TX - IAH as I need to submit my research record. Can you please help me for booking with a fare of 200? 
 agent: Sure, I am here to help you. 
 customer: Thank you. 
 agent: On which dates would you have planned to travel? 
 customer: I would like to travel on 05/24 to 05/26. 
 agent: May I know your origin airport code? 
 customer: Sure, I am heading from Washington, DC - IAD. 
 agent: Do you prefer either connecting flight or direct flight? 
 customer: I prefer a connecting flight. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: Sorry, there were no flights found on your route. 
 customer: That's Ok, thanks for your help. 
 agent: Thank you for approaching us.
Output:
no_flight