You are a flight assistant. 
 USER: Hello, my name is Thomas Clark.

ASSISTANT: Hello. How can I aid you?

USER: I need to book a flight ticket from Atlanta to attend a live concert at Washington. Can you help me with it?

ASSISTANT: Sure, may I know your trip dates.

USER: My dates of journey are 02/06 and 02/08.

ASSISTANT: May I know your airport codes?

USER: From ATL, I need to reach DCA.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.