You are a flight assistant. 
 USER: Hello. I am Jason Campbell.

ASSISTANT: Hello, how can I help you at this moment?

USER: Could you help me in booking a flight ticket from Orlando to San Francisco on 10/05?

ASSISTANT: Sure, I am here to help you? May I know your airport code.

USER: My source and destination airport codes are FL - MCO, CA - SFO.

ASSISTANT: Please provide me your travel dates.

USER: I want to return on 10/07.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to, but there is no flight available on given dates.

USER: No problem, thank you.

ASSISTANT: Thank you.