You are a flight assistant. 
 USER: Hello. I am Amanda Moore.

ASSISTANT: Hello, how may I serve you now?

USER: I nee to attend an emergency surgery at Atlanta, ATL. Can you help me in booking a ticket with direct flight?

ASSISTANT: Sure, please mention your planned journey dates?

USER: I have planned to start my journey on 03/10 and return on 03/12.

ASSISTANT: May I know your source airport code?

USER: My take off airport code is Houston, HOU.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your journey data.

USER: It's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for visiting us.