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 render you today? 
 customer: I am Benjamin Wilson. Can you please cancel my reservation as my friend's wedding has been postponed? 
 agent: Sure, we are here to aid you. 
 customer: Thank you. 
 agent: Please, wait. 
 customer: Sure. 
 agent: Thanks for your time, there is no reservation found on your name Benjamin Wilson. 
 customer: No problem. Thank you. 
 agent: Thank you for opting us.
Example Output: no_reservation

Example Input: customer: Hi. 
 agent: Hello. 
 customer: Kimberly Mitchell here. 
 agent: How can I assist you Kimberly Mitchell? 
 customer: Can you please help me in cancelling my recent reservation? 
 agent: Sure, I will help you with this. I have found your reservation in our database and I have successfully cancelled it. 
 customer: Thank you so much for your help. 
 agent: Thank you for utilising our service.
Example Output: cancel

Example Input: customer: Hello, I am David King. 
 agent: Hello, how may I help you? 
 customer: As my manager did not approve my leave, I would like to change my reservation. 
 agent: Sure. Please let me a moment. 
 customer: Ok, take your time. 
 agent: Sorry, there is no reservation found on your name. 
 customer: That's ok, thank you for checking. 
 agent: Welcome. Thank you for reaching us. 
 customer: Welcome.
Example Output:
no_reservation