You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello, I am Brandon Robinson.

ASSISTANT: How can I help you today?

USER: I want to attend an interview in Austin, Can you book me a direct flight?

ASSISTANT: Sure, help me with your travelling dates?

USER: I start on 12/23 and return on 12/25.

ASSISTANT: Ok, help me with your airport codes?

USER: My airport codes are AZ - PHX and TX - AUS.

ASSISTANT: Any price limit?

USER: The price should not exceed 200.

ASSISTANT: Ok, please wait I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: OK, no problem. Thank you for the help.

ASSISTANT: Thanks for choosing us.