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

Q: 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.

A: no_reservation
****
Q: customer: Hi. 
 agent: Hello, how may I aid you? 
 customer: Joseph Garcia here. I would like to spend some more days with my family, so please help me in changing my existing reservation. 
 agent: Sure, I am here to help you out. Please allow me a moment. 
 customer: Ok. 
 agent: Sorry  Joseph Garcia, there is no active reservation on your name in our database. 
 customer: That's ok, thank you for your help. 
 agent: Thank you for reaching us.

A: no_reservation
****
Q: customer: Hello. 
 agent: Hello. How may I guide you? 
 customer: I am Sarah Edwards. I am planning to cancel my recent reservation. Can you please cancel my ticket? 
 agent: Sure, I can help you to cancel your ticket. 
 customer: Sure. 
 agent: Please wait a minute, I will check your ticket and then I will proceed with the ticket cancellation. 
 customer: Sure, take your own time. 
 agent: Ok Sarah Edwards, I have found your ticket in the confirmation list. 
 customer: Please cancel it. 
 agent: I have successfully cancelled your ticket. 
 customer: Thank you for your service. 
 agent: You are welcome.

A:
cancel
****