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 Input:
customer: Hello,. 
 agent: Hello, how can I help you today? 
 customer: I have planned to travel from Houston, TX- IAH to Atlanta, GA- ATL. 
 agent: Sure, please provide me your journey dates? 
 customer: Sure, my travelling dates are from depart day on 11th Nov and return on 13th Nov. 
 agent: OK, please wait I will revert you in a while. 
 customer: OK, sure. 
 agent: Thank you for your patience. Sorry, there were no flights available on the specified  dates you mentioned. May I know your good name? 
 customer: OK, no issues. Thank you the information. I am Mary Jackson. 
 agent: OK, thank you for contacting us, have a good day.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: Can you find me a direct flight to Washington? 
 agent: Sure, I am here to help you. 
 customer: Thank you. 
 agent: Kindly, share your selected airport codes. 
 customer: My source point is OAK and destination is IAD. 
 agent: May I know that when you have planned to travel? 
 customer: I will fly on Sept 08 and return on Sept 10. 
 agent: Do you prefer a connection limit? 
 customer: I prefer a direct flight. 
 agent: Is there any other concerns to say? 
 customer: No. 
 agent: On whose name, you want to reserve the ticket? 
 customer: My name is Virginia Phillips. 
 agent: Ok, please wait for a few minutes. 
 customer: Sure. 
 agent: Sorry to say that, no flights are found based on your given information. 
 customer: Ok, thank you for the information. 
 agent: Thank you for choosing us.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello, how can I assist you? 
 customer: I am Benjamin Thompson, can you find a flight for me? I am planning for a trip from LAG to LAX. 
 agent: Ok, may I know your travelling details? 
 customer: My travelling dates are 08/29 and 08/31. Did you find any flight for me? 
 agent: Sorry, there is no flight available for you. 
 customer: That is fine. 
 agent: Thank you for reaching us. 
 customer: Thank you for your help.

Ex Output:
no_flight