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

Let me give you an example: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
The answer to this example can be: no_reservation
Here is why: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation

OK. solve this:
customer: Hi. I am Debra King. 
 agent: Hello, how may I assist you today? 
 customer: I want to book a flight ticket from AZ-PHX to PA-PHL. Can you help me? 
 agent: Sure, can you please mention the dates of your journey? 
 customer: Thank you. 10/30 and 11/01 are my travelling dates. 
 agent: Do you have any class preference? 
 customer: I am comfortable with any class. But, I need to depart in morning. 
 agent: May I know your connection limit? 
 customer: I need a break. 
 agent: Ok, please wait for a minute. 
 customer: Ok. 
 agent: We found a connecting flight in American Airlines with flight number 1023 departs in the morning at 5:00 AM. Shall I proceed to book your ticket in economy class? 
 customer: You can reserve it for me. 
 agent: Your booking has been confirmed. 
 customer: Thank you for your help. 
 agent: Thank you for opting us.
Answer:
book