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 Jerry Lopez. 
 agent: Hello, how can I help you today? 
 customer: Could you please reserve me a flight ticket to Houston, TX - IAH from Denver, CO - DEN? 
 agent: Sure, we are here to help you. 
 customer: Thank you. 
 agent: Kindly mention your travel dates. 
 customer: My travel dates are 07/06 - 07/08. 
 agent: How much can you afford for this journey? 
 customer: I can afford up to 500 only. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: There is a flight with your requirement, airline is AA with price 200 and single connection. Shall I proceed with booking? 
 customer: Please reserve. 
 agent: Your booking is done and flight number is 1026. 
 customer: Thank you. 
 agent: Thanks for reaching us.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. Can you please help me out in changing my reservation? 
 agent: Sure, I am here to help you. May I know your name? 
 customer: Thank you and myself Brian Wilson. 
 agent: Ok, please wait for a moment. 
 customer: Sure. 
 agent: Thank you for your time, There was no reservation found on your name in our database. 
 customer: It's ok, thank you for your help. 
 agent: Thank you for choosing us.

Output: no_reservation


Input: Consider Input: customer: Hi. 
 agent: Hello, how can I help you today? 
 customer: Can you help me to book a flight from PHL to DTW? 
 agent: Sure, let me know your travel dates? 
 customer: I would like to travel on Sept 26 and 28. 
 agent: Do you have any requirements? 
 customer: I need a connecting flight. 
 agent: Ok, may I know your name please? 
 customer: My name is Sandra Hall. 
 agent: United Airlines has a connecting flight with number 1005 for fare 100, shall I proceed? 
 customer: Proceed with booking. 
 agent: Your ticket is reserve in economy class. 
 customer: Thank you. 
 agent: Thank you for opting us.
Output: book