You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Charles Allen. Can you please make me reservation from OAK to AUS?

ASSISTANT: Ok, may I know your journey dates?

USER: Sure, my journey dates are 02/21 and 02/23. Please check for the direct flight?

ASSISTANT: Sorry, there is no flight for you.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Welcome Charles Allen.