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 Kimberly Turner. 
 agent: Hello, what can I do for you today? 
 customer: I need to change my reservation as my get together program postponed. Can you help me? 
 agent: Sure, please wait for few minutes. 
 customer: Sure. 
 agent: There is no recent reservation found on your name in our data base. 
 customer: That's Ok, thanks for your assistance. 
 agent: Thank you for reaching us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: Please book a ticket from ORD to PHL to attend my sister wedding. 
 agent: Sure, please share your planned travel dates? 
 customer: My travelling dates are Mar 23 and Mar 25. 
 agent: Do you have any connection limit? 
 customer: I am comfortable with any connection. 
 agent: Can I have your name please? 
 customer: Sure, I am Laura Hernandez. 
 agent: Any other preferences? 
 customer: No. 
 agent: Southwest airline flight 1011 available with connection limit 1 and fare is 100, shall I confirm this economy class flight? 
 customer: Ok, please proceed. 
 agent: Ok, your ticket has been processed. 
 customer: Thank you. 
 agent: Thank you for opting us.

Output: book


Input: Consider Input: customer: Hi. 
 agent: Hello. How may I assist you today? 
 customer: Can you please book me a flight ticket from LAS to PHL? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: Please help me with your name. 
 customer: I am Sarah Garcia. 
 agent: Please let me know with your planned travel dates. 
 customer: I want to start my journey on Sept 11th and return on Sept 13th. 
 agent: Do you need a direct or connecting flight? 
 customer: I am comfortable with both. 
 agent: Please let me know with your preferences in your journey. 
 customer: I want an economy class to travel. 
 agent: Do you have any other preferences in your journey? 
 customer: No. 
 agent: Please allow me a minute. 
 customer: Ok. 
 agent: We have a  connecting flight with two breaks operated by American Airlines with a fare of 100. Is it ok for you? 
 customer: Yes, please proceed. 
 agent: I have booked your ticket in economy class flight-1026. It departs at 0 AM and arrives at 12 PM. 
 customer: Thank you. 
 agent: Thank you for reaching us. Have a great time.
Output: book