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

Example Input: customer: Hi. I am Edward Walker. 
 agent: Hello, Please inform me, How may I assist you the day? 
 customer: Prepone plan came into a picture owing to announcement of birth of baby boy.So I need to cancel my recent reservation. Can you please help me in cancellation? 
 agent: Sure, I can help you in that cancellation. 
 customer: Thank you. 
 agent: Please allow me a moment to check for the previous reservation in our data base. 
 customer: Sure. 
 agent: We are sorry to inform that, there is no active reservation found on your name. 
 customer: Ok, no issues. Thank you. 
 agent: Thanks for choosing us. wish you a nice day.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello. 
 customer: I am Sandra Evans. 
 agent: How can I assist you today? 
 customer: I want to change my travel dates in my previous reservation, can you please help me with that? 
 agent: Sure, please give me a moment. 
 customer: Ok. 
 agent: Thanks for waiting, there is no reservation found under your name. 
 customer: Oh! May be I am not booked my ticket properly at that time. Thank you for your service. 
 agent: Welcome, have a great day.
Example Output: no_reservation

Example Input: customer: Hi. 
 agent: Hello. 
 customer: I am Jessica Young. 
 agent: How may I help you? 
 customer: I would like to meet my friend on her birthday at Phoenix, PHX. Can you reserve me a flight ticket from Philadelphia, PHL? 
 agent: Please let me know your travelling dates. 
 customer: My planned journey dates are 09/03 and 09/05. 
 agent: Connecting flight can be booked with airline Delta for price 200. Shall I book a ticket? 
 customer: Yes, please. 
 agent: Your ticket is booked having flight number 1010. 
 customer: Thank you for assisting me. 
 agent: Thanks.
Example Output:
book