You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Raymond Brown here.

ASSISTANT: How can I aid you Raymond?

USER: I am a wrestler, I have to participate in a match at Philadelphia. So please book my ticket from Seattle.

ASSISTANT: Please mention your trip dates.

USER: My itinerary dates are 12/20 and 12/22.

ASSISTANT: May I know your travel airport codes?

USER: My origin and destination airport codes are SEA and PHL.

ASSISTANT: Sorry Brown, there is no flight available for you.

USER: No problem, thank you.

ASSISTANT: Most welcome, have a nice day.