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

Example Input: customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am George Evans. I want to change my existing reservation due to postpone of my trip. Could you please help me? 
 agent: Sure, just a moment please. 
 customer: Sure. 
 agent: I am sorry no reservation found on your name. 
 customer: No worries, thank you for the information. 
 agent: Thank you for choosing us.
Example Output: no_reservation

Example 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.
Example Output: no_flight

Example Input: customer: Hello. 
 agent: Hello. How may I help you? 
 customer: Myself Justin Wright from Orlando. I have to go to Washington next month for my film shooting purpose. Can you please book a flight ticket from MCO to DCA? 
 agent: May I know your travel dates? 
 customer: Thank you for your positive response, I want to departure on 01/27 and please confirm my return ticket also on 01/29. 
 agent: Sorry for this inconvenience, I could not find any flight with your requirements. 
 customer: Oh! It's ok no problem. Thank you for your information. 
 agent: Thank you for reaching us.
Example Output:
no_flight