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

customer: Hi. 
 agent: Hello. How can I assist you? 
 customer: Due to some issues, I am willing to change my existing reservation. Can you please help me for this? 
 agent: Sure, can I know your name please? 
 customer: I am Rebecca Lee. 
 agent: Ok, wait a moment please. 
 customer: Sure. 
 agent: Sorry, there is no reservation found on your name. 
 customer: Oh! It may not be booked properly due to some technical issues while booking. Thank you for checking. 
 agent: Thank you for approaching us.
no_reservation

customer: Hello, I am Thomas Young. 
 agent: Hello Thomas Young. How can I help you today? 
 customer: I have planned a trip with my friends, can you help in the process of booking ticket. 
 agent: Sure, can you provide me your travellings details? 
 customer: My travelling is from San Francisco, CA - SFO to Detroit, MI - DTW. My travelling dates are on 04/24 to 04/26. 
 agent: Sure, wait for a moment, I will revert you. 
 customer: I need a single connection with price of 5000. Sure,. 
 agent: Thanks for waiting. We could not find any flights for your specification. 
 customer: OK, thank you for the information. Thank you. 
 agent: Thank you for reaching us.
no_flight

customer: Hello. 
 agent: Hello. How can I help you? 
 customer: Myself Benjamin Edwards. I want to book a ticket from DEN to DTW. 
 agent: Can I know your travel dates? 
 customer: My trip dates are from 07/05 to 07/07. 
 agent: Ok. Sorry Edwards, there are no flights available on your request. 
 customer: Oik, thank you for your help. 
 agent: Welcome.
no_flight