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 Shirley Martinez. 
 agent: Hello, how can I serve your today? 
 customer: I want to visit HOU from my hometown PHL, can you help me with single connection of flight? 
 agent: Sure, may I know your travelling dates? 
 customer: My depart is on 04/26 and return on 04/28. 
 agent: please mention your connections. 
 customer: I need a lay by in between journey. 
 agent: There is a Frontier 1002 with fare of 100 which matches your travelling dates. Shall I proceed with booking? 
 customer: OK, proceed with booking. 
 agent: Your booking has been confirmed on name of Shirley Martinez. 
 customer: Thank you for the help. 
 agent: Thank you for approaching us.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: I am Carolyn Mitchell. 
 agent: How may I assist you? 
 customer: Owing to an emergency, I want to cancel my recent reservation. Can you help me out? 
 agent: Please hold on a moment. 
 customer: Ok, take your time. 
 agent: Thanks for your time, there is no reservation found on your name to cancel it. 
 customer: That's ok. Anyways, thank you. 
 agent: Thanks for contacting us.

Output: no_reservation


Input: Consider Input: customer: Hi. 
 agent: Hello, what can I do for you at this moment? 
 customer: I am Andrew Johnson. I want to book a ticket to Denver, CO-DEN, can you please book me a ticket from Seattle, WA-SEA? 
 agent: Sure, on what dates you do need to book your ticket? 
 customer: My travel dates are from 05/10 to 05/12. 
 agent: Ok, let me check the availability of flights. 
 customer: Ok. 
 agent: Thank you for your time, there is a flight available in Spirit airline having single connection and you need to pay only 200. 
 customer: OK, please proceed for booking. 
 agent: Your booking has been done in flight 1007. 
 customer: Thank you. 
 agent: Thank you for choosing us.
Output: book