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: Hi. Dennis Hall here. 
 agent: Hello. How can I help you? 
 customer: Reserve a flight ticket that is from SEA to CLT. 
 agent: Can you please tell your travelling dates? 
 customer: My travel dates are from 03/18 to 03/20. 
 agent: Sorry, there are no flights available with your requested details. 
 customer: Ok, not a problem. Thank you. 
 agent: Thank you and have a nice day.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello, how may I help you? 
 customer: I planned to meet my friend in HOU, can you please help me to book a flight ticket from AUS? 
 agent: Sure, please share your journey dates? 
 customer: I prefer to travel on Sep 24 and Sep 26. 
 agent: Do you have any specifications? 
 customer: I would like to return back in afternoon. 
 agent: Is there any class preference? 
 customer: No. 
 agent: May I know your good name? 
 customer: I am Jason Garcia. 
 agent: Sorry, no flights found on your given details. 
 customer: Ok, no problem. Thank you for your information. 
 agent: Thank you for choosing us.

Ex Output:
no_flight


Ex Input:
customer: Hello. I am Jeffrey Moore. Please change my reservation as my meeting was postponed. 
 agent: Hello Jeffrey. Sure, please hold on a moment, I will check and get back to you. 
 customer: Ok. 
 agent: Sorry, there is no reservation found on given name. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for reaching us.

Ex Output:
no_reservation