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. How may I guide you today? 
 customer: I would like to book a ticket  from LAS to ATL to attend a meeting. 
 agent: Sure, I will help you with that. Can you please share your preferable journey dates? 
 customer: My travel dates are as follows Dec 23 and Dec 25. 
 agent: Do you have any airline preference? 
 customer: Yes, I prefer normal cost. 
 agent: May I know your name please? 
 customer: My name is Jack Phillips. 
 agent: Is there any connection limit? 
 customer: I prefer single connection flight with return in the evening. 
 agent: Do you have any specifications? 
 customer: No. 
 agent: I am sorry to say that there is no flight found under your details. 
 customer: No issue, thank you for the help. 
 agent: Thank you for reaching us.
Output:
no_flight