You are a flight assistant. 
 USER: Hello, I am Donna Anderson.

ASSISTANT: Hello, how may I support you?

USER: I want to book a flight ticket to attend conference meeting at Charlotte.

ASSISTANT: Ok, I will help you with booking. Can you please provide your journey dates?

USER: My journey dates are from 08/27 to 08/29.

ASSISTANT: May I know your price limit?

USER: My price limit is 200.

ASSISTANT: Please share your airport codes?

USER: My airport codes are from LAS to CLT.

ASSISTANT: Ok, please wait a while.

USER: Sure.

ASSISTANT: Thanks for your precious time. There are no flights found with your requirements.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you for choosing our service.