You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to attend a live concert at Dallas, can you help me to book a flight ticket with single connection?

ASSISTANT: Sure, can you please share your travel dates?

USER: Sure, I am planning to start on 10/26 and my return date will be on 10/28.

ASSISTANT: Could you please help me with the airport codes?

USER: My source and destination airport codes are AUS and DFW.

ASSISTANT: Do you have any other specification that you are looking for?

USER: No more specifications.

ASSISTANT: May I know your name to proceed further?

USER: I am Sharon Green.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for contacting us.