You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to travel from DTW to DCA, can you help me to find a flight? My travel dates are 10/10 and 10/12.

ASSISTANT: Sure, could you please tell me your journey dates? Ok, fine. Let me check. May I know your name please?

USER: I am Barbara Williams.

ASSISTANT: Sorry to inform you Barbara, there is no flight available at your requested dates.

USER: It's ok. Thanks for helping me.

ASSISTANT: Thank you for contacting us.