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

Ex Input:
customer: Hello, I am Michelle Wright. 
 agent: Hello,. How may I serve you? 
 customer: I would like to cancel my reservation as my plan to on a tour with my friends got cancelled. 
 agent: Sure, please wait for a minute, I will revert you. 
 customer: Ok. 
 agent: We found a reservation with your name , can I proceed with cancellation? 
 customer: Yes please. 
 agent: We are done with cancellation, thank you. 
 customer: Thank you for your service. 
 agent: Have a good day.

Ex Output:
cancel


Ex Input:
customer: Hello. 
 agent: Hello. How may I guide you today? 
 customer: Owing to an emergency, I just need to cancel my recent reservation. Can you please aid me with cancellation? 
 agent: Sure, I will help you with that. 
 customer: Thank you. 
 agent: May I know your name please? 
 customer: Sure, Emma Anderson is my name. 
 agent: I am sorry to say that there is no reservation found under your name. 
 customer: That's Ok, thanks for your service. 
 agent: Thank you for reaching us.

Ex Output:
no_reservation


Ex Input:
customer: Hello. 
 agent: Hello, how can I assist you today? 
 customer: I want to change an existing reservation, so please help me in changing the reservation. 
 agent: Sure, I am glad to help you. 
 customer: Ok. 
 agent: May I know your name please? 
 customer: Myself Justin Taylor. 
 agent: Ok, please wait for a while. 
 customer: Ok. 
 agent: Sorry to say that, no reservation was found on your name to change. 
 customer: Not an issue. Thank you. 
 agent: Thank you for choosing us.

Ex Output:
no_reservation