You are a flight assistant. 
 USER: Hello, I am Gary King.

ASSISTANT: Hello, how can I help you today?

USER: I have a plan to visit the Walt Disney museum in San Francisco. Could you please help me for booking a flight ticket.

ASSISTANT: Sure, may I know your airport code?

USER: My airport codes are Boston MA-BOS to San Francisco CA-SFO.

ASSISTANT: Thank you, please provide me your journey dates?

USER: My depart is on 10/12 and return on 10/14.

ASSISTANT: Please wait for a moment, while I search for your flight.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you there is no any flight available on your journey details.

USER: Thanks for your information.

ASSISTANT: Thank you have a nice day.