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 aid you? 
 customer: I want to book a ticket from DTW to LAX to attend Sports meet. 
 agent: Sure, we are pleased to serve you. 
 customer: Can you please book a ticket with single connection? 
 agent: Can you share me your itinerary dates? 
 customer: My travelling dates June 21 and June 23. 
 agent: Do you need any way station in your journey? 
 customer: Yes, I prefer single way station. 
 agent: Is there any class preference for you? 
 customer: No. 
 agent: Do you have any other preferences? 
 customer: Yes, I prefer normal-cost airline. 
 agent: May I know your good name please? 
 customer: Sure, Emma Collins here. 
 agent: Sorry to say, there are no flights available with your needs. 
 customer: Ok, Thank you. 
 agent: Thank you for availing us.
Output:
no_flight