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
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Question: customer: Hello. 
 agent: Hello. 
 customer: Myself Kevin Johnson. 
 agent: Kevin, how can I assist you? 
 customer: Can you please help me in booking a flight ticket from DEN to EWR locations? 
 agent: Sure, may I know your trip dates? 
 customer: My travelling dates are from 07/02 and 07/04. 
 agent: Please hold on for a moment. 
 customer: Ok. 
 agent: Sorry, no flight is available on your route. 
 customer: It's ok. Thank you for the information. 
 agent: Thank you for choosing us.

Answer: no_flight


Question: customer: Hello. 
 agent: Hello, how may I help you? 
 customer: I am George Hall, want to travel from IAH to SFO>. 
 agent: May I know your trip dates? 
 customer: My travel dates are from 06/05 to 06/07. Please check the flight with 1 connection. 
 agent: There is no reservation found under your name. 
 customer: It's ok, thank you. 
 agent: Most welcome.

Answer: no_flight


Question: customer: Hi. 
 agent: Hello. How may I serve you now? 
 customer: I am Kathleen Young. I need to change my existing reservation, Can you please help me with that? 
 agent: Sure, I am here to help you. 
 customer: Thank you. 
 agent: Please, wait a while. 
 customer: Sure. 
 agent: Thank you for being patience. Sorry to inform you that, there is no reservation found on your name. 
 customer: Ok, no problem. 
 agent: Ok, thank you for approaching us. 
 customer: Thanks for your information.

Answer:
no_reservation