You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I am Brandon Hernandez. I want to book a flight ticket to visit Lady Bird Lake in Austin, so please help me in booking a flight ticket.

ASSISTANT: Sure, we are glad to help you. May I know at what price you are looking for airfare?

USER: I can afford up to 5000.

ASSISTANT: Can you please let me know your preferred journey dates?

USER: I want to fly on 12/06 and return on 12/08.

ASSISTANT: Kindly assign your source and destination points?

USER: My source is Charlotte, NC - CLT and destination code is TX - AUS.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Thank you for your patience. No flights are available on respective dates of travel.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us. Have a good day.