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
One example is below.
Q: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
A: no_reservation
Rationale: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation
Q: customer: Hi. 
 agent: Hello, how can I guide you for today? 
 customer: Rebecca Hall here. I would like to book a ticket from DCA to IAH, can you please help me with that? 
 agent: Can you please share on what dates you are willing to travel? 
 customer: The travel dates are from 01/24 to 01/26. 
 agent: Please give me a minute, I will check the availability of flights on this route. 
 customer: Ok. 
 agent: There is a flight with ticket fare 200 in UA airlines with a stopover. Is it ok for you? 
 customer: Please proceed. 
 agent: Your booking is confirmed with flight number 1012. 
 customer: Thank you for your help. 
 agent: Thank you for contacting us, have a nice day.
A:
book