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

Input: Consider Input: customer: Hello. 
 agent: Hello, what can I do for you today? 
 customer: My name is Karen Hill and I want to book the flight ticket from LAS to EWR. Can you please help me? 
 agent: Sure, may I know your travel dates? 
 customer: My travel dates are May 17 and May 19. 
 agent: Let me know your class preference? 
 customer: I am comfortable with any class. 
 agent: Do you have any other requirements to be met? 
 customer: I need a single connection flight. 
 agent: Sorry, no flights found on your travel dates. 
 customer: Ok, thank you for the information. 
 agent: Thank you for contacting us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello, How can I assist you? 
 customer: I am Pamela Martinez. 
 agent: May I know your travelling details? 
 customer: Actually I need to cancel my reservation. Can you please help me? 
 agent: Sure, Please wait a minute. 
 customer: OK. 
 agent: Sorry, No reservation found on your name. Thank you for choosing us. 
 customer: Its k cool. Thank you.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hi. How can I help you? 
 customer: Myself Linda Nelson. I want to attend my cousin's marriage.I just want to book a ticket. 
 agent: Sure, please provide me your details? 
 customer: My airport codes are from NY-EWR to NC-CLT. 
 agent: May I know you dates please? 
 customer: My trip dates are from 03/11 to 03/13. 
 agent: Delta airlines is matching your needs with 1001 fight number. Can I confirm your booking? 
 customer: Ok, please book my ticket. 
 agent: Your ticket was confirmed. 
 customer: Thank you. 
 agent: Thank you.
Output: book