You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book a ticket from TX-AUS to WA-SEA.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are 05/11 and 05/13.

ASSISTANT: Do you have any restrictions about your price limit?

USER: Yes, the price should be within 5000.

ASSISTANT: Can you please provide your name for further proceeding?

USER: Sure, I am Anthony White.

ASSISTANT: I'm really feeling bad to say this there are no flights on your preferred dates.

USER: OK, that's fine.

ASSISTANT: Thank you for such a positive response.

USER: Thank you for your time.

ASSISTANT: It's my pleasure.