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 help you? 
 customer: I am planning to visit CLT to attend business meeting, can you please help me in booking a flight ticket from HOU? 
 agent: Your trip dates please. 
 customer: My trip dates are May 6 and May 8. 
 agent: Do you have any connection limit? 
 customer: Yes, I need a connecting flight. 
 agent: Do you have any other preferences? 
 customer: Yes, I prefer to depart during evening and please look for an economy class. 
 agent: Your name please. 
 customer: Edward Martin here. 
 agent: Sorry to say that, there are no flights found with your details. 
 customer: Not an issue, anyway thank you for checking. 
 agent: Thank you for reaching us.
Output:
no_flight