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: Hi. 
 agent: Hello, how may I aid you today? 
 customer: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that? 
 agent: Sure, may I know your good name? 
 customer: I am Kevin Clark. 
 agent: Ok, please wait for a minute. 
 customer: Sure. 
 agent: I have checked in reservation list to change your ticket, but could not find any reservation with your name. 
 customer: Ok, no issues. Thanks for the information. 
 agent: Thank you for reaching us.

Ex Output:
no_reservation


Ex Input:
customer: Hi,. 
 agent: Hello. 
 customer: My name is Elizabeth Wilson. 
 agent: How may I assist you? 
 customer: Can you please book a flight ticket with in the range of 200 from Seattle? 
 agent: Sure, may I know on which dates you would like to travel? 
 customer: Sure, 09/12 - 09/14 are my travelling dates. 
 agent: Help me with the airport codes? 
 customer: My source code is WA - SEA and destination code is Houston, TX - IAH. 
 agent: Sorry, we do not found any flights running in your given details. 
 customer: Ok, not a problem. Thank you. 
 agent: Thank you for reaching us.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello. 
 customer: I am Angela Jackson. 
 agent: How may I guide you today? 
 customer: Can you please help me with booking a flight ticket from HOU to LAX? 
 agent: Can you please share your preferable journey dates? 
 customer: Journey dates are 10/31 and 11/02. 
 agent: Is there any class preference? 
 customer: No. 
 agent: Is there any connection limit? 
 customer: I need a connecting light. 
 agent: Do you have any specifications? 
 customer: I would like to depart at afternoon. 
 agent: I found a ticket for you with price of 200, flight number is 1027 in economy class and  connection is 1. Is it ok for you? 
 customer: You can proceed with booking. 
 agent: I confirmed your ticket successfully. 
 customer: Thanks for the help. 
 agent: Thank you for reaching us.

Ex Output:
book