You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Emma Moore. I am planning to book a ticket to meet my friend at SFO. Can you please help me out to book a ticket from DCA?

ASSISTANT: Sure, can you please share me with your dates of journey?

USER: I would like to travel on 04/14 and return back on 04/16.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Moore, there is no flight found as per your travelling details.

USER: That's fine. Thank you for reaching us.

ASSISTANT: You are welcome always.