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 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. 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.
Example Output: no_flight

Example Input: customer: Hi. 
 agent: Hello, how can I help you today? 
 customer: Can you help me to book a connecting flight? 
 agent: Sure, may I know your source and destination points? 
 customer: Sure, my airport codes are from JFK to DEN. 
 agent: May I know your planned travel dates? 
 customer: Sure, my journey dates are from July 07 to 09. 
 agent: Do you have any other specifications? 
 customer: No. 
 agent: May I know your good name to proceed further? 
 customer: My name is Ryan Miller. 
 agent: We found an airline: JetBlue, flight number: 1024 and price is 100 with one connection. 
 customer: Proceed with booking. 
 agent: Your flight ticket has been reserved. 
 customer: Thank you. 
 agent: Thank you for reaching us.
Example Output:
book