You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am planning to taste Various and understand Cooking methods at DCA. So can you please help me in booking a flight ticket from SFO?

ASSISTANT: Sure, please share your travel dates?

USER: My trip dates are Mar 1 to Mar 3.

ASSISTANT: Do you have any preferences?

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

ASSISTANT: Do you have any other preferences?

USER: I prefer a economy class.

ASSISTANT: May I know your name?

USER: I am Linda Allen.

ASSISTANT: Sorry, I did not find any flights for you.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.