You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Steven Walker. Can you please search a direct flight for me?

ASSISTANT: Sure, I am here to help you. Could you please let me know your journey dates to search a flight?

USER: My journey dates are 08/27 and 08/29.

ASSISTANT: May I know your airport codes?

USER: My travelling airport codes are JFK - SFO.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no flight is available for you.

USER: Ok, fine thank you for searching.

ASSISTANT: Thank you for choosing us, have a nice day.