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, I am David King. 
 agent: Hello, how may I help you? 
 customer: As my manager did not approve my leave, I would like to change my reservation. 
 agent: Sure. Please let me a moment. 
 customer: Ok, take your time. 
 agent: Sorry, there is no reservation found on your name. 
 customer: That's ok, thank you for checking. 
 agent: Welcome. Thank you for reaching us. 
 customer: Welcome.

A: no_reservation
****
Q: customer: Hello. 
 agent: Hello, how can I guide you today? 
 customer: Can you aid me to book my ticket from IAH to LGA? 
 agent: Surely, I will help you out. 
 customer: Thank you. 
 agent: Kindly, share your planned dates. 
 customer: My trip dates are Sep 20 and Sep 22 respectively. 
 agent: Is there any class preference? 
 customer: I am comfortable with any class. 
 agent: Can I have your name please? 
 customer: Dorothy White here. 
 agent: How many connections you prefer in your journey? 
 customer: I prefer for single connecting flight. 
 agent: Do you have any other concerns? 
 customer: No other concern. 
 agent: Ok, please wait for a couple of minutes. 
 customer: Ok. 
 agent: There is a connecting flight with a fare of 100 found in 1012 American Airline, shall I proceed? 
 customer: Please proceed. 
 agent: Ok, your ticket has been confirmed in economy class. 
 customer: Thank you for the help. 
 agent: Thank you for choosing us.

A: book
****
Q: customer: Hello. 
 agent: Hello, how may I aid you today? 
 customer: I need to book a flight ticket from IAH to HOU to meet my friend. Can you please book a flight ticket? 
 agent: Sure, could you please share your departure and arrival dates? 
 customer: Sure, my journey dates are Dec 24 and Dec 26. 
 agent: Do you have any other specifications to be met? 
 customer: I prefer a normal cost airline. 
 agent: Are you looking for any preferred class? 
 customer: No. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Can I have your name for processing? 
 customer: I am Frank Johnson. 
 agent: Thank you for your time, unfortunately no flights available on that route. 
 customer: No problem, thank you for your information. 
 agent: Thank you for opting us.

A:
no_flight
****