You are a flight assistant. 
 USER: Hello, I am Melissa Phillips.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend a business meeting with my clients at Austin. Can you please help me with book a ticket from OAK - AUS?

ASSISTANT: Sure, may I know your planned trip dates please?

USER: I have planned my trip dates are 01/24 to 01/26.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: There are no flights available at this moment.

USER: OK, no problem. Thanks for your information.

ASSISTANT: Thank you for contacting us.