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 help you? 
 customer: I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. Can you please help me out in changing my reservation? 
 agent: Sure, I am here to help you. May I know your name? 
 customer: Thank you and myself Brian Wilson. 
 agent: Ok, please wait for a moment. 
 customer: Sure. 
 agent: Thank you for your time, There was no reservation found on your name in our database. 
 customer: It's ok, thank you for your help. 
 agent: Thank you for choosing us.

Ex Output:
no_reservation


Ex 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.

Ex Output:
no_reservation


Ex Input:
customer: Hello. 
 agent: Hello. How may I guide you? 
 customer: Myself Frank Anderson. I will be travelling from Oakland to visit my grandmother, can you help me? 
 agent: Sure, can I know your preferable dates? 
 customer: My travel dates will be from 10/25 to 10/27. 
 agent: Can I know your airport codes? 
 customer: My travelling airport codes will be from OAK to MSP. 
 agent: I found a flight 1017 which matches with your preferences, can I proceed? 
 customer: May I know the price? 
 agent: The price of ticket is 200. 
 customer: Ok, please book this flight for my journey. 
 agent: Your ticket is booked with Hawaiian airlines. 
 customer: Thank you for assisting me with booking my reservation. 
 agent: Thank you, have a good day. 
 customer: Most welcome.

Ex Output:
book