Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hi. I am Samantha Phillips. 
 agent: Hello, How may I abet you? 
 customer: I want to book a flight ticket within the price of 500. Can you help me in this? 
 agent: Sure, I can help you. 
 customer: Thank you. 
 agent: Please provide your travelling dates? 
 customer: My trip dates are 09/06 - 09/08. 
 agent: Kindly mention your boarding and landing airport codes? 
 customer: My airport codes are AUS - CLT. 
 agent: Sorry, we do not found any flights running to your preferable locations due to abnormal weather conditions. 
 customer: Not a problem. Thank you. 
 agent: Thanks for opting us.
Student:
no_flight