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 help you today? 
 customer: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation? 
 agent: Let me know your name to check your reservation? 
 customer: I am Dorothy Adams. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name. 
 customer: No problem, thank you for the information. 
 agent: Thank you for choosing us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello. How can I aid you at this moment? 
 customer: Deborah Robinson here. I would like to visit Philadelphia for business meeting in the month of September, can you please help me out with booking of a flight ticket to go there? 
 agent: Sure, I will assist you with that. Can you please mention your preferable airport code names for booking flight ticket? 
 customer: Sure, I will prefer EWR and PHL as my origin and destination airport codes for booking. 
 agent: May I know your trip dates for further process? 
 customer: I am planning to leave on 09/19 and please book my return ticket on 09/21. 
 agent: Thank you for providing your travel details. I will put the conversation on hold to check the best flights available in your route. 
 customer: Ok, take your time. 
 agent: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 200 is provided by Hawaiian airlines. Shall I proceed with this? 
 customer: That's fine for me, you can proceed with booking. 
 agent: Your flight ticket is booked successfully, flight number is 1002. 
 customer: Thank you for your kind assistance in booking of my ticket, have a nice day. 
 agent: Thank you for choosing us, have a nice day.
Example Output: book

Example Input: customer: Hello, Rebecca Thompson here. 
 agent: Hello. How can I help you? 
 customer: Can you book my flight ticket from DFW to SEA? 
 agent: May I know your travelling dates please? 
 customer: My travelling dates are from 02/26 to 02/28. Please make sure this, I want direct flight from my location to destination. 
 agent: I am Sorry, there are no flights with your connection limit. 
 customer: It's ok. Anyways, thank you to search. 
 agent: Thank you for approaching us.
Example Output:
no_flight