Instructions: 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
Input: customer: Hi. 
 agent: Hello, How can I help you? 
 customer: Can you help me to book a flight from LAS to AUS? 
 agent: Sure, May I know the travelling dates? 
 customer: My travelling dates are 11/29 and 12/01. 
 agent: Do you have any connection limit? 
 customer: I need a connecting flight. 
 agent: Do you have any preference in airline? 
 customer: I prefer normal cost airline. 
 agent: May I know your name? 
 customer: My name is Pamela Wilson. 
 agent: Please wait a minute. 
 customer: Ok. 
 agent: Sorry, No flights found with your chosen dates. 
 customer: No issues, thank you for your time. 
 agent: Thank you for opting us.
Output:
no_flight