You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Rachel Garcia.

ASSISTANT: How can I assist you?

USER: I am planning to visit Korean war veterans memorial in Washington DCA. Can you help me to book a connecting flight?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travel dates are Aug 27 and 29.

ASSISTANT: Could you please provide the source airport code?

USER: My source is from Philadelphia, PHL.

ASSISTANT: May I know the departure and return time please?

USER: I want to return in the evening time.

ASSISTANT: Do you have any requirements?

USER: No.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Ok, thank you.

ASSISTANT: Thank you for approaching us.