You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you for today?

USER: I am planning a trip with my friends to visit National Liberty Museum at Philadelphia, can you please book me a ticket?

ASSISTANT: Yes, I will try for my best assistance.

USER: Thank you.

ASSISTANT: Can I know your nearest airport codes for travelling?

USER: My nearest origin airport code is OAK and my nearest destination airport code is PHL.

ASSISTANT: Ok, could you please share your dates of travel?

USER: I would like to depart on 09/19 and would return on 09/21.

ASSISTANT: Give me a moment, I will get back to you with flight details.

USER: Please find a direct flight on this route for my convenience.

ASSISTANT: Sorry to say that there is no direct flight found on your requested dates.

USER: It's ok, I will find any alternate for this trip.

ASSISTANT: Sorry for the inconvenience. Can I know your name for documentation purpose?

USER: My name is George Miller.

ASSISTANT: Thank you for reaching us.

USER: Thank you for providing information.