Detailed 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
Problem:customer: Hello. 
 agent: Hello, how can I aid you? 
 customer: Can you please help me to book a ticket from BOS to DCA? 
 agent: Sure, can you provide your journey dates? 
 customer: My travelling dates will be on Sept 6 to Sept 8. 
 agent: Do you have any preferences? 
 customer: I would prefer a connecting flight. 
 agent: May I know your name? 
 customer: Carolyn Garcia here. 
 agent: There is a connecting flight with number 1002 in airline JetBlue, the fare is 100 in economy class. Can I book it? 
 customer: I would prefer a economy class and I want to depart in the morning. Please check morning flight for me. 
 agent: Sorry, there is no flight which depart in the morning. 
 customer: Ok, not an issue. Thank you. 
 agent: Thank you for reaching us.
Solution:
no_flight