You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I serve you?

USER: I am Gregory Hill. I am planning to visit NASCAR hall of fame museum at Charlotte, can you please help me in reserving a flight ticket?

ASSISTANT: Sure. May I know your travelling dates?

USER: I want to travel on 05/21, and need to catch return flight on 05/23.

ASSISTANT: Can you share me your airport codes?

USER: I need to leave from my nearest airport LAS to reach CLT.

ASSISTANT: Do you have any preferences?

USER: Make sure to check a flight with in a price limit of 200.

ASSISTANT: Thanks for your details.

USER: Ok.

ASSISTANT: Thee is no flights found on your data.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thanks for the information.