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: Hi. 
 agent: Hello, how may I lend a hand to? 
 customer: I need to change my existing reservation as my trip got postponed, Can you please help me with that? 
 agent: Sure, I am here to help you for this. Could you please mention your name? 
 customer: Kevin Williams here. 
 agent: Please wait for a while, let me check your reservation status in our records. 
 customer: Sure. 
 agent: Sorry for inconvenience, no reservation is found with your criteria. 
 customer: Ok, no problem. Thanks for your information. 
 agent: Thank you very much for contacting our agency.
Example Output: no_reservation

Example Input: customer: Hi. I am Samuel Baker. 
 agent: Hello, how may I assist you today? 
 customer: I want to change my reservation owing an emergency. 
 agent: Sure, we are glad to serve you. Please wait for a while, let me check your reservation with us. 
 customer: Ok. 
 agent: Thanks for your time, unfortunately no reservation found with your name. 
 customer: Ok, thank you for your service. 
 agent: Thank you for availing us, have a great day ahead.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello, how may I help you? 
 customer: Can you please help me in booking my flight ticket from LAS to PHL? 
 agent: I am glad to help you. May I know your planned travel dates? 
 customer: My travelling dates are May 13 and May 15. 
 agent: Do you have any connection limit preference? 
 customer: I need single connection flight. 
 agent: Could you help me with your name please? 
 customer: Myself Raymond King. 
 agent: Sorry, there are no flights available for the mentioned dates. 
 customer: Ok, thank you for checking. 
 agent: Thank you for reaching us.
Example Output:
no_flight