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

[EX Q]: customer: Hello. 
 agent: Hello\. How may I help you? 
 customer: Mark Phillips here. Can you please help me in booking the ticket from LGA to AUS? 
 agent: May I know your trip dates? 
 customer: My trip dates are 03/21 and 03/23. 
 agent: There is a direct flight with flight number 1018, can I proceed? 
 customer: Please search for a flight with 1 halt. 
 agent: I am sorry to inform you that there is no flight available with 1 connection. 
 customer: That's ok, thank you for giving the information. 
 agent: Thank you for contacting us.
[EX A]: no_flight

[EX Q]: customer: Hello. I am Kimberly Harris. 
 agent: Hello, how may I aid you at this moment? 
 customer: Can you please help me in booking a flight ticket to HOU as I am planning to attend for meeting in Cobo center? 
 agent: Sure, may I know your travelling dates? 
 customer: My travelling dates are 10/05 and return on 10/07. 
 agent: Ok, please provide your source airport code? 
 customer: My source code is DTW. 
 agent: There are no flights found on your requested dates. Thank you for reaching us. 
 customer: No problem, thank you for your information.
[EX A]: no_flight

[EX Q]: customer: Hello. 
 agent: Hello. How can I help you? 
 customer: Can you help me to book a flight ticket from PHL to IAD? 
 agent: Sure. Let me know your travelling dates. 
 customer: My travel dates are Oct 03 and Oct 05. 
 agent: Can I know your name? 
 customer: My name is Sarah Taylor. 
 agent: Do you have any preference? 
 customer: I prefer connecting flight on this route. 
 agent: Found ticket with airline Southwest for price 100 having flight number 1000. 
 customer: Please proceed to book my flight ticket in this airlines. 
 agent: Ticket is booked. 
 customer: Thank you. 
 agent: Thank you.
[EX A]:
book