You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Debra Edwards. I would like to travel from IAD to ATL, could you help me out?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My preferable dates are from 04/25 to 04/27.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

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

ASSISTANT: Thank you for approaching us.