You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Nancy Davis. I would like to travel from DCA to LAX, could you help me out?

ASSISTANT: Sure, can you please share your travel dates?

USER: My preferable dates are from 10/07 to 10/09.

ASSISTANT: Let me check for the availability of flight.

USER: Sure.

ASSISTANT: Nancy, I am sorry to inform you that there is no flight available at your requested dates.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for reaching us. have a great day.