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: Hello. 
 agent: Hello,. How may I help you? 
 customer: As I am in an emergency to reach Phoenix due an urgent meeting. Can you please help me to book a flight ticket with direct flight? 
 agent: Sure. Please let me know your travelling codes? 
 customer: My travelling dates are 11/30 and 01/02. 
 agent: May I know your travelling  codes? 
 customer: Sure, my source code is CLT and destination code is PHX. 
 agent: Please provide your name? 
 customer: Yes, I am Carolyn Campbell. 
 agent: No flight exists with your requirement. Thanks. 
 customer: Not an issue, I will go with another service to book my flight ticket. Anyway thank you for the information. 
 agent: Have a nice day!.
Student:
no_flight