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 Q]: customer: Hi. This is Michelle Clark, from Dallas. 
 agent: Hello, How may I assist you? 
 customer: Recently I made a reservation and now the trip has been postponed due to some issues. Can you help me in changing my ticket? 
 agent: Sure, I can help you. 
 customer: Thank you. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Thanks for your time, there is no reservation found in your name. 
 customer: That's ok, not an issue. Thanks for your effort. 
 agent: Thank you for choosing us.
[EX A]: no_reservation

[EX Q]: customer: Hi. 
 agent: Hello, how may I help you? 
 customer: Can you help me to cancel my reservation? 
 agent: Sure, please share your good name? 
 customer: My name is Steven Brown. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Sorry, no reservation found on your given name. 
 customer: No issues, thank you for your time. 
 agent: Thank you for choosing us.
[EX A]: no_reservation

[EX Q]: customer: Hello, I am Matthew Garcia. 
 agent: Hello, how could I assist you? 
 customer: As my schedule of attending an press conference got postponed. Can you please help me in changing my existing reservation? 
 agent: Please wait for sometime. 
 customer: Sure. 
 agent: There is no reservation found on your given name. 
 customer: Ok, no issues. Thank you for your information. 
 agent: Thank you for reaching us.
[EX A]:
no_reservation