You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Debra Turner.

ASSISTANT: How can I help you?

USER: I am planning to attend business meeting at DFW, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Yes, I can help you. Can you share me your travelling dates?

USER: Sure, I would like to take off on 10/21 and return back on 10/23.

ASSISTANT: Sorry to inform you that there is no flight found on your requested dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.