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. 
 customer: I am Nancy Adams. 
 agent: How can I help you Adams? 
 customer: I would like to change my recent existing reservation because my friend who is participating in gun shooting has been postponed. 
 agent: I will help you, please wait a while. 
 customer: Ok. 
 agent: There is no reservation found on your name, Nancy Adams. 
 customer: No problem, thank you. 
 agent: Thanks for opting us.
Example Output: no_reservation

Example Input: customer: Hi. 
 agent: Hello, how may I be at your service today? 
 customer: Due to some entrepreneurship meeting, I am going to change my existing reservation. 
 agent: May I know your name please to check the status of your reservation? 
 customer: Sarah Lopez here. 
 agent: Thank you. Please stay online for a while, I will check your reservation status and let you know. 
 customer: Sure. 
 agent: Sorry, there is no reservation matching with your name in our portal to make changes further. 
 customer: No problem, thanks for the information. 
 agent: Thank you for reaching us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello. How may I serve you at this moment? 
 customer: I want to cancel my recent reservation which I have done last week because my trip got cancelled. Please help me out with that. 
 agent: Sure, may I know your good name please? 
 customer: Myself Michael Lopez. 
 agent: Ok, please wait for few minutes. 
 customer: Sure. 
 agent: There is no recent reservation found on your name in our records. 
 customer: It's ok, thank you for your help. 
 agent: Thank you for reaching us.
Example Output:
no_reservation