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 help you? 
 customer: Can you avail me to book a flight from AUS to PHX? 
 agent: Sure, I can help you with that. May I know your travel dates please? 
 customer: My travel dates are Oct 08 and 10. 
 agent: Do you prefer break in between your journey? 
 customer: Yes, I need a break. 
 agent: Please let me know if you have any other specifications. 
 customer: I want to depart in the evening time. 
 agent: Can I have your good name please? 
 customer: Shirley Davis here. 
 agent: Sorry, no flights available for you on those dates with your given details. 
 customer: Ok, thank you. 
 agent: Thank you for choosing us.
no_flight