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. 
 agent: Hello. How may I assist you? 
 customer: Michelle Johnson here. 
 agent: Nice to meet you Michelle Johnson. 
 customer: I want to book a flight from DCA - DTW to meet a friend, can you help me? 
 agent: Sure, I am here to help you. 
 customer: My travelling dates will be from 04/01 to 04/03. 
 agent: Ok, let me check the flight availability with your preferences. 
 customer: Ok, please check for 1 connection flight. 
 agent: Sorry, there is no flight found on your route. 
 customer: Oh! Thanks for checking. 
 agent: Ok, thanks for contacting us. 
 customer: Most welcome.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I support you now? 
 customer: I am Kimberly Roberts. I want to book a ticket from JFK to OAK to attend seminar, can you help me in booking? 
 agent: Sure, please share me your planned journey dates? 
 customer: I am departing on Aug 31 and return on Sep 02. 
 agent: Please mention your connection limit? 
 customer: I need a flight with connection limit 1. 
 agent: May I know your depart and return flight timing? 
 customer: I want to return time in morning time. 
 agent: Do you have any other requirement? 
 customer: I do not have any other specifications. 
 agent: Thank you for the flight details, sorry there is no flight available on your given journey route. 
 customer: That's ok, thank you for your information. 
 agent: Thank you for visiting us, we hope see you again.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: I am John Clark. 
 agent: Can you please tell me how can I assist you? 
 customer: I would like to travel from CLT to SFO to meet my parents, can you help me in booking? 
 agent: May I know your travel dates? 
 customer: I am departing on 05/07 and return on 05/09. 
 agent: I found a flight ticket with price 100 and connection limit is 1 with 1020 flight number. 
 customer: Please proceed for booking. 
 agent: Ok, your ticket has been booked. 
 customer: Thank you for your help. 
 agent: Most welcome.
Output: book