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. 
 customer: I am Debra Brown. 
 agent: How can I assist you today? 
 customer: I would like to book a ticket from DEN to ATL, can you please help me out? 
 agent: Sure, can you please share your travel dates? 
 customer: I am travelling on these dates 12/25 and 12/27. 
 agent: Let me check for the availability of flight. 
 customer: Make sure my connection limit is 0. 
 agent: Debra, I am sorry to inform you that there is no flight available at your request. 
 customer: Ok no problem, thank you for your services. 
 agent: Thank you for contacting us, have a great day.
Solution:
no_flight