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,. I am Susan Gonzalez. 
 agent: Hello, how can I help you? 
 customer: I need to book a flight ticket from Seattle to meet my grandparents after a long time in Washington. Can you please help me in booking? 
 agent: Sure, may I know your planned travel dates? 
 customer: My depart is on 03/17 and arrival on 03/19. 
 agent: Please share me your source and destination codes. 
 customer: My source code is WA-SEA and destination code is DC-IAD. 
 agent: May I know your price limit? 
 customer: I can spend up to 5000. 
 agent: Please wait for a moment. 
 customer: Ok. 
 agent: Thanks for waiting, sorry to say that, no flights were found with your details. 
 customer: Ok, no issue. 
 agent: Thank you for opting us. 
 customer: Thank you for your support.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation? 
 agent: Let me know your name to check your reservation? 
 customer: I am Dorothy Adams. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name. 
 customer: No problem, thank you for the information. 
 agent: Thank you for choosing us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am George Evans. I want to change my existing reservation due to postpone of my trip. Could you please help me? 
 agent: Sure, just a moment please. 
 customer: Sure. 
 agent: I am sorry no reservation found on your name. 
 customer: No worries, thank you for the information. 
 agent: Thank you for choosing us.
Output: no_reservation