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. 
 agent: Hello. 
 customer: Ryan Campbell here. 
 agent: How can I assist you? 
 customer: I want to travel from Charlotte to Dallas for attending a Marriage. Can you please help me for booking the flight ticket? 
 agent: Sure Ryan, please provide me your airport codes. 
 customer: My airport codes are from CLT to DFW. 
 agent: May I know your journey dates please? 
 customer: My travelling dates are from 06/03 to 06/05. 
 agent: Please wait for a minute. 
 customer: Ok, I will wait. 
 agent: Ryan, there are no flights available at this moment. 
 customer: Anyway, thanks for the information. 
 agent: Thank you for contacting us, have a good day.
Output:
no_flight