You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Jack Collins here. I want to attend a Marriage in San Francisco. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I can help you and  may I know your preferable travel dates?

USER: My travelling dates are 03/18 and 03/20.

ASSISTANT: May I know your regional airport codes?

USER: My airport codes are PHL and SFO.

ASSISTANT: Thank you for your information, there is no flight found on your journey dates to book a ticket.

USER: Anyway, thanks for the information.

ASSISTANT: You are  most welcome and have a nice day.