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
Q: customer: Hi. 
 agent: Hello. How may I guide you today? 
 customer: Can you please reserve me a flight ticket from DEN to CLT? 
 agent: Sure, can you please share your preferable journey dates? 
 customer: My trip dates are 12/31 - 01/02. 
 agent: May I know your name please? 
 customer: Katherine Miller here. 
 agent: Do you have any connection limit? 
 customer: I need a direct flight. 
 agent: Is there any specifications? 
 customer: No, thank you for asking. 
 agent: I am sorry to say that there is no flight found under your details. 
 customer: Not a problem, thank you. 
 agent: Thank you for reaching us.
A:
no_flight