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

Ex Input:
customer: Hello, I am Brandon Jackson. 
 agent: Hello. How may I assist you today? 
 customer: I need to book a flight ticket to attend my sister baby shower function. 
 agent: Ok. Let me know your journey details. 
 customer: I would like to travel from DFW to SEA. My journey dates will be on 11/25 to 11/27. 
 agent: Please wait for a minute, I will check and let you know the details. 
 customer: Sure. 
 agent: Thanks for waiting. You have AA airline with flight number 1009 of price 300 with double connection limit. Can I proceed with this? 
 customer: I need only one connection limit. Please do not proceed for booking. 
 agent: Ok. 
 customer: Thank you. 
 agent: Thank you for reaching us.

Ex Output:
no_reservation


Ex Input:
customer: Hello. 
 agent: Hello,. 
 customer: I am Shirley Phillips. 
 agent: How shall I assist you? 
 customer: I want to cancel my reservation due to heavy rainfall at my place. 
 agent: I'm sorry, no reservation found by name Shirley Phillips. 
 customer: Ok, thank you for informing me. 
 agent: Thanks. Have a nice day!.

Ex Output:
no_reservation


Ex Input:
customer: Hello, Helen Walker here. 
 agent: Hello, how can I assist you? 
 customer: I am planning to visit Seattle, can you please book me a ticket from ATL to SEA? 
 agent: Sure, may I know your travel dates please? 
 customer: My preferable journey dates are from 12/12 to 12/14. 
 agent: Southwest airlines is having a flight with travel charge of 100, shall I proceed for booking? 
 customer: Please book my ticket with this flight. 
 agent: Your ticket has been booked with flight-1020, have a safe journey. 
 customer: Thank you for booking my ticket. 
 agent: Thank you for choosing us.

Ex Output:
book