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: Hello. 
 agent: Hello, how can I help you? 
 customer: I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. Can you please help me out in changing my reservation? 
 agent: Sure, I am here to help you. May I know your name? 
 customer: Thank you and myself Brian Wilson. 
 agent: Ok, please wait for a moment. 
 customer: Sure. 
 agent: Thank you for your time, There was no reservation found on your name in our database. 
 customer: It's ok, thank you for your help. 
 agent: Thank you for choosing us.

A: no_reservation
****
Q: customer: Hello,. 
 agent: Hello, How may I assist you today? 
 customer: My friends house warming function was postponed due to under construction. So I want to cancel my recent reservation. 
 agent: Sure, May I know your name please? 
 customer: Sure. I am Virginia Turner. 
 agent: Ok, please wait for a minute, I will check and let you know. 
 customer: sure. 
 agent: Thanks for your patience. Unfortunately, there is no reservation found with your name. 
 customer: Ok, no problem. 
 agent: Thank you for approaching us. 
 customer: Thank you for assisting me.

A: no_reservation
****
Q: customer: Hello. 
 agent: Hello,. How may I amend you? 
 customer: I am Robert Smith. 
 agent: Ok. 
 customer: I have a plan to meet my childhood friend in Houston, TX - HOU. Can you aid me for booking from Los Angeles, CA - LAX? 
 agent: Sure, I am gleeful to help you. Please mention your planned dates? 
 customer: Sure, I have a plan to travel on 11/14 to 11/16. 
 agent: How much you can afford for a flight ticket? 
 customer: I can afford up to 1000. 
 agent: Ok, are you looking for direct flight or connecting flight? 
 customer: I need a connected flight. 
 agent: Please wait, let me check and get back to you. 
 customer: Sure. 
 agent: Thanks for your time, I found a connecting flight from Hawaiian airline of fare 100 and flight number 1027. Shall I confirm? 
 customer: Sure, you can proceed for booking. 
 agent: Your flight ticket is processed. 
 customer: Thank you,. 
 agent: Thanks for opting us, have a good day.

A:
book
****