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, I am Kimberly Turner. 
 agent: Hello, what can I do for you today? 
 customer: I need to change my reservation as my get together program postponed. Can you help me? 
 agent: Sure, please wait for few minutes. 
 customer: Sure. 
 agent: There is no recent reservation found on your name in our data base. 
 customer: That's Ok, thanks for your assistance. 
 agent: Thank you for reaching us.
Example Output: no_reservation

Example Input: customer: Hi, I am John Nelson. 
 agent: Hello, what kind of assistance you are looking for? 
 customer: Can you please help me with booking a flight ticket from LAX to IAD? 
 agent: Sure, I am ecstatic to help you. 
 customer: Thank you. 
 agent: Let me know, how much you can afford for this journey? 
 customer: I can afford up to 5000. 
 agent: Do you have any class preference? 
 customer: I prefer business class. 
 agent: Kindly, share your travelling dates to proceed further. 
 customer: Travel dates are 12/06 and 12/08. 
 agent: Thank you for sharing your details. Please, hold on for a while. 
 customer: Ok. 
 agent: Thank you for waiting, there are no flights available with your requirements. 
 customer: Ok, no issues. Thanks for the help. 
 agent: Thank you for approaching us.
Example Output: no_flight

Example Input: customer: Hi. 
 agent: Hello. 
 customer: Sandra Phillips here. 
 agent: How may I assist you? 
 customer: I would like to travel Las Vegas to meet my grandfather, can you please book a flight ticket from EWR to LAS? 
 agent: Sure, may I know your travel dates? 
 customer: Ok, my planned dates of journey are 10/07 and 10/09. 
 agent: Do you have any specifications? 
 customer: Please check for a connecting flight. 
 agent: There is no flight on your details. 
 customer: Ok, no problem. 
 agent: Thank you. 
 customer: Thank you so much.
Example Output:
no_flight