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 today? 
 customer: Can you please cancel my existing reservation as my plan to go for holiday trip got cancelled? 
 agent: Sure, can I know your name? 
 customer: I am Rachel Jones. 
 agent: Ok, please wait. 
 customer: Sure. 
 agent: Thanks for waiting. 
 customer: Ok. 
 agent: We found reservation on your name and it has been cancelled successfully. 
 customer: Thank you. 
 agent: Thank you for opting us.
Example Output: cancel

Example Input: customer: Hello. 
 agent: Hello. How may I help you? 
 customer: I need to cancel my recent reservation, as my planned trip with my friends got cancelled. Can you please help me out? 
 agent: Ok, please mention your name to check your reservation status. 
 customer: Sure, myself Stephanie Carter. 
 agent: Thanks for your response, there is no reservation found under your name to cancel it. 
 customer: Not a big problem, anyway thank you for the information. 
 agent: Welcome Stephanie Carter. 
 customer: Thank you for searching.
Example Output: no_reservation

Example Input: customer: Hello,. 
 agent: Hello, how may I help you? 
 customer: I am Mark Lewis, I want to change my existing reservation as my company meeting got postponed. 
 agent: Sure Mark, please wait a moment I'll check the details of your reservation. 
 customer: Sure. 
 agent: Sorry for the inconvenience, there is no reservation found on your name. 
 customer: Ok, no problem . Thank you for the information. 
 agent: Thank you for approaching us. Have a nice day!.
Example Output:
no_reservation