You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I need to go Austin, TX - AUS for my singing competition, can you help me in booking a flight ticket on 03/19?

ASSISTANT: Sure, may I know your price limit?

USER: Sure, I can afford up to 1000.

ASSISTANT: Can you please provide your Source code and return date?

USER: Sure, I will start from DEN and return back on 03/21.

ASSISTANT: Let me know your good name please.

USER: Sure, Joseph Scott here.

ASSISTANT: Thank you for sharing your details, Unfortunately there is no flight found matching with your requirements.

USER: Ok, no problem. Thanks for your time.

ASSISTANT: Thank you for reaching us.