You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anna Baker.

ASSISTANT: How can I assist you at this moment?

USER: I need to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, I will help you in booking the flight ticket. Could you please provide your nearest airport codes of journey?

USER: My source point is SEA and destination point is PHL.

ASSISTANT: May I know your planned dates of journey please?

USER: I would like to travel on 12/09 to return on 12/11.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Anna Baker, there are no direct flight services available on this route on your provided dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for contacting us.