You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Samuel Green. Can you please check any flights available to travel from DCA to ATL?

ASSISTANT: Sure, can you please help me with your dates?

USER: Sure, I am planning from 02/15 to 02/17.

ASSISTANT: Wait a moment please.

USER: Ok.

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

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.