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, David Davis here. 
 agent: Hello. How can I help you? 
 customer: I planned to attend for an event in DCA, can you please help me to book a flight ticket from HOU? 
 agent: Sure, can you please tell your travelling dates? 
 customer: I planned to start on 08/09 and return back on 08/11. 
 agent: For your destination I found a flight with 1 connection and ticket price is just 400 from Spirit airline. Shall I proceed the process? 
 customer: Yes, please proceed to book. 
 agent: Your reservation is confirmed with flight 1017. Have a safe journey. 
 customer: Thank you for your valuable service. 
 agent: Thank you and have a nice day.

Output: book


Input: Consider Input: customer: Hello. Frank Edwards here. 
 agent: Hello Frank, how may I aid you? 
 customer: Due to an emergency, I want to cancel my reservation. Can you please help me for that? 
 agent: Sure, wait a moment to check your previous reservation status. 
 customer: Ok. 
 agent: Sorry Frank, we don't found any reservation under your name. Would you like to ask us anything else? 
 customer: Nothing, thank you for the information. 
 agent: Ok, thank you for reaching us, have a nice day.

Output: no_reservation


Input: Consider Input: customer: Hello, I am Matthew Evans. 
 agent: Hello, how may I assist you? 
 customer: I am having an interview at Chicago. Can you book a ticket for me? 
 agent: Sure, I am here to help you. May I know your travel dates please? 
 customer: I am planning to start on 08/07 and return back on 08/09. 
 agent: Ok, may I know your airport codes please? 
 customer: Search for the flight available from PHX to ORD. 
 agent: Ok, hold on for a moment. Let me check the best flight for you. 
 customer: Take your time but make sure that connection limit is 1. 
 agent: Sorry Evans, there are no flights available on your requested dates. 
 customer: No issues. Thank you for checking. 
 agent: Welcome, thank you for choosing us. Have a great day.
Output: no_flight