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 can I aid you today? 
 customer: I am Andrew Hill. I want to know about ticket availability to DEN from PHX. Will you please give the information? 
 agent: Sure, we are here to help you. Can you please provide your journey dates? 
 customer: Yeah. My journey dates are 12/26 and 12/28. 
 agent: Ok, please wait a moment. I will check the availability. 
 customer: OK. 
 agent: Thanks for your time. There is a flight with airline JetBlue and airline number is 1026. Fare of ticket is 200 with one connection. Shall I proceed with this booking? 
 customer: You can proceed. 
 agent: Your ticket has been reserved. Thank you for connecting wit us. Have a safe journey.

Ex Output:
book


Ex 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.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello, how may I aid you? 
 customer: I am Cynthia Harris. I want to book a ticket from LAX to SEA, can you help me? 
 agent: Sure, may I know your preferred dates of travel? 
 customer: My travel dates are Feb 25 and 27. 
 agent: Do you have any specifications? 
 customer: I want to travel in economy class only. 
 agent: Ok, please wait a minute. 
 customer: I want to return in the morning. 
 agent: Sorry to say that there were no flights found on your route. 
 customer: No problem, thanks for checking. 
 agent: Thank you.

Ex Output:
no_flight