You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Katherine Baker.

ASSISTANT: How can I assist you?

USER: I want to book a flight ticket with a single connection. My price limit is 500.

ASSISTANT: May I know your airport codes?

USER: My origin from TX - AUS and destination to TX - DFW.

ASSISTANT: Please share me your travelling dates?

USER: My departure is 03/01 and return date on 03/03.

ASSISTANT: Please hold on a moment, Let me check the status and get back to you.

USER: Sure.

ASSISTANT: We are very sorry to notify you that there is no flight found on your matching preferences.

USER: Not an issue. Thank you, for your service.

ASSISTANT: Thank you for opting us.