You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
Solution: no_reservation
Why? Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation

New input: customer: Hello. 
 agent: Hello, how can I assist you today? 
 customer: Myself Anna Harris. I need to reach Charlotte to attend a business meeting so please help me with flight ticket booking. 
 agent: Sure, kindly mention your trip dates please? 
 customer: Sure, I need to travel on dates of 05/26 and 05/28. 
 agent: Let me know your airport codes? 
 customer: Sure, I would like to travel from ATL to CLT. 
 agent: Ok,wait for some time. 
 customer: Sure, take your time. 
 agent: Unfortunately there is no flights found on your details. Thanks for connecting us. 
 customer: It's ok fine, thank you for your time.
Solution:
no_flight