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: Hi. 
 agent: Hello. How can I assist you at this moment? 
 customer: I want to reserve my ticket from JFK to AUS to visit Austin, can you please help me in booking? 
 agent: Sure, I am here to help you. Can you please provide your journey dates? 
 customer: Ok, my planned dates of journey are from Nov, 14 to Nov, 16. 
 agent: Do you have any connection limit preference? 
 customer: I want to travel in a direct flight. 
 agent: Do you have any other specifications for this journey? 
 customer: Not required. 
 agent: May I know your good name please? 
 customer: Sure, my name is Larry Lopez. 
 agent: Larry Lopez, we regret to inform you that there are no direct flight services are available on this route on your provided dates. 
 customer: Ok, no problem. Anyways, thank you for your service. 
 agent: Thank you for contacting us.
Output:
no_flight