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: Consider Input: customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am planning to visit Philadelphia, can you please book me a ticket from LAS to PHL? 
 agent: Sure, I will help you. Can you please share your travel dates? 
 customer: My preferable journey dates are from 03/17 to 03/19. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Hawaiian airlines are providing service on your route with 1 connection and fare is 100. Can I proceed? 
 customer: Please book my ticket with the name Margaret King. 
 agent: Ok. Your booking is done with flight 1012. 
 customer: Thank you for booking my ticket. 
 agent: Thank you for choosing us.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: I am Justin Lee. Can you help booking a flight ticket from LGA to ATL? 
 agent: Sure, may I know your planned travel dates please? 
 customer: I will start on 01/03 and return on 01/05. 
 agent: Would you like to travel in a connecting flight or a direct flight? 
 customer: I am comfortable with any flight. 
 agent: Do you have any other specifications? 
 customer: I need to depart in the morning time. 
 agent: Sorry, there is no flight available on your requested dates. 
 customer: No problem, thank you for the information. 
 agent: Thank you for reaching us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. How may I assist you at this moment? 
 customer: Myself Sandra Phillips. Can you please book a flight ticket from SFO to LGA? 
 agent: Sure, may I know your planned dates of travelling? 
 customer: Sure, I need to travel on dates of 04/05 and 04/07. 
 agent: Please wait a moment to check the flights availability. 
 customer: Sure, take your time. 
 agent: Sorry to inform you that, there are no flights moving to your region with your planned dates of travelling. 
 customer: Oh! It is sad to hear. Anyway, I will go  with another agency this time. 
 agent: Thank you for approaching us, have a great day. 
 customer: Thank you for your time. 
 agent: Welcome.
Output: no_flight