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: Hi. I am Edward Hall. 
 agent: Hello. How can I help you today? 
 customer: I want to conduct a sports festival at Seattle. Can you help me in finding a flight with 1 connection? 
 agent: Sure, I am glad to help you. 
 customer: Thank you. 
 agent: Please share your travelling dates. 
 customer: My journey dates are from 06/25 to 06/27. 
 agent: Please provide your airport codes? 
 customer: It is a round trip, my airport code is Seattle, WA - SEA. 
 agent: Ok, please wait for a while. 
 customer: Ok. 
 agent: Thanks for waiting, flight- 1014, airline- Southwest, price- 100 with connection matches with your requested details. 
 customer: Proceed with my booking. 
 agent: Ok, your ticket has been booked. 
 customer: Thank you for your help. 
 agent: Thanks for choosing us.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello. How can I aid you? 
 customer: I am planning to change an exiting reservation, due to health issue.Can you please change my reservation? 
 agent: Sure. May I know your name? 
 customer: My name is Patricia Brown. 
 agent: Please wait a while. 
 customer: Sure. 
 agent: Thanks for being waiting, We didn't found any reservation by this name. 
 customer: That's fine, thank you for your help. 
 agent: Thank you for opting us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello! tell me how may I help you? 
 customer: Can you help me to change my existing reservation? 
 agent: OK, can you please tell me your name ? 
 customer: Yes, my name is William Thompson. 
 agent: Sorry, William  no reservation found on your name. 
 customer: Ok, thank you. 
 agent: Thank you.
Output: no_reservation