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. 
 agent: Hello, How can I assist you the day? 
 customer: I am planning to visit a Central Park at New York due to some issues it was postponed, so can you help me with changing my existing reservation? 
 agent:  Sure, I am here to serve you. Please mention your name to proceed to next step? 
 customer: My name is Kenneth Miller. 
 agent: Ok, please wait for a minute. I will revert to you. 
 customer: Sure, I will wait. 
 agent: Thank you for the patience. We did not find any reservation that matches with your name. 
 customer: Not an issue. Thank you for your response. 
 agent: Thank you for approaching us, regarding ticket changing procedure.

Ex Output:
no_reservation


Ex Input:
customer: Hi. 
 agent: Hello. How can I help you at this moment? 
 customer: I want to change my existing reservation which is done recently due to some health issues, can you please help me? 
 agent: Sure, I will aid you in changing your reservation. 
 customer: Thank you for considering my request. 
 agent: May I know your name please. 
 customer: Sure, my name is Joshua Green. 
 agent: Sorry to say this, no reservation found on your name in our database. 
 customer: Ok, no problem. Thank you for your service. 
 agent: Thank you for reaching us.

Ex Output:
no_reservation


Ex Input:
customer: Hi. 
 agent: Hello. How may I assist you? 
 customer: Please book a flight ticket on a connecting flight. 
 agent: Sure, I am here to help you. Can you please share your airport codes? 
 customer: My airport codes are from OAK to LAS. 
 agent: On which dates you would like to travel? 
 customer: My trip dates are 09/22 and 09/24. 
 agent: May I know your departure and arrival time? 
 customer: I am comfortable with any timings. 
 agent: Do you have any other requirements? 
 customer: No, thanks for asking. 
 agent: Ok, please share your name. 
 customer: I am Thomas Scott. 
 agent: Sorry, there are no flights in this route as per your travelling details. 
 customer: That's ok, thank you for your information. 
 agent: Thank you for choosing us.

Ex Output:
no_flight