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, Patrick Smith here. 
 agent: Hello. How can I help you? 
 customer: We friends were planning to go for Nutshell Bike Tour to Austin, TX-AUS on 08/16. Can you hold me a ticket with single connecting flight? 
 agent: Sure, may I know source code and return journey date please? 
 customer: Sure, I will be back on 08/18 at Orlando, FL-MCO. 
 agent: There is a flight with single connection, can I proceed for booking in 1004 flight? 
 customer: Ok, please proceed. 
 agent: Your booking is done in UA airlines, have a safe journey. 
 customer: Thank you. 
 agent: Thank you for choosing us.

Output: book


Input: Consider Input: customer: Hi. 
 agent: Hello, how may I help you? 
 customer: Unfortunately I have an emergency meeting so I want to cancel my reservation, can you please help in cancelling my reservation? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: May I know your good name please ? 
 customer: I am Emma Young. 
 agent: Please wait for a while. 
 customer: Ok. 
 agent: Sorry, there is no reservation found on your given name. 
 customer: Ok, no problem. Thank you for your quick response. 
 agent: Thanks for choosing us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: Is it Central Booking Agency? 
 agent: Yes, say what help are you expecting from my side? 
 customer: Can you book a flight ticket from AUS to LGA? 
 agent: Sure, please mention your dates of trip? 
 customer: It's from 02/09 to 02/11. 
 agent: Ok, please hold on for a moment. 
 customer: Ok, take your time. 
 agent: Sorry, there is no flight is available as per your respective details. 
 customer: Ok, no problem. 
 agent: May I know your name please? 
 customer: Sure, my name is Brenda Clark. 
 agent: Thank you for your information. 
 customer: That's ok. 
 agent: You are welcome.
Output: no_flight