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 may I help you out? 
 customer: I am planning to attend a Atlanta ATL from Orlando MCO. Can you find a flight ticket for me? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 customer: Sure, my planned trip dates are on Dec 30 and return Jan 01. 
 agent: Can I know your preferences? 
 customer: Ok, I prefer an economy class. 
 agent: Do you need any specifications? 
 customer: Yes, I need a single connecting flight. 
 agent: Sorry, there are no flights found. 
 customer: Ok, not an problem. . 
 agent: Thank you for reaching us. Can I confirm your name please? 
 customer: Yes, I am Brenda Garcia. 
 agent: Thank you. 
 customer: Thank you for your help.
Output:
no_flight