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, I am Edward Thompson. 
 agent: Hello, How can I assist you? 
 customer: I am planning for a holiday vacation at Boston, can you please book a flight ticket? 
 agent: Sure, May I know the travel date details? 
 customer: I want to travel on 04/06 and arrival is on 04/08. I do not need connections in between my journey. 
 agent: May I know the source and destination details? 
 customer: My journey starts from Oakland, CA-OAK to Boston, MA-BOS. 
 agent: Sorry, There is no direct flight. Thank you for availing us. 
 customer: Thank you.
[EX A]: no_flight

[EX Q]: customer: Hi. I am Anna Lewis. 
 agent: Hello, how can I assist you? 
 customer: I want to book a flight ticket to participate in a cultural fest at IL-ORD on 09/07. Can you help me? 
 agent: Sure, please provide your return journey date. 
 customer: 09/09 will be my return. 
 agent: Please share your origin airport code. 
 customer: NV-LAS will be my origin. 
 agent: Please share your specifications. 
 customer: I need a connecting flight. 
 agent: Unfortunately, there is no flights based on your details. 
 customer: No issue. Thank you. 
 agent: Thank you for choosing us.
[EX A]: no_flight

[EX Q]: customer: Hi. 
 agent: Hello, how may I aid you today? 
 customer: Can you please help me with booking a flight ticket from EWR to CLT? 
 agent: Sure, can you please let me know your dates of journey? 
 customer: My journey dates are Dec 08 and 10. 
 agent: May I know your good name please? 
 customer: My name is Kenneth Perez. 
 agent: Are you looking for any other help from my side please? 
 customer: I prefer to travel in normal cost airlines. 
 agent: Please wait for a mean while. 
 customer: Ok. 
 agent: Sorry Perez, there is no flight found as per your travelling details. 
 customer: Ok, no issues. Thank you. 
 agent: You are welcome.
[EX A]:
no_flight