You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Nicholas Taylor. I would like to visit Disney land with my friends at Seattle, please book the ticket from DCA to SEA.

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

USER: My trip dates are Sep 27 to Sep 29.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight which depart in evening.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

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

USER: No issue, thank you.

ASSISTANT: Thank you for approaching us.