You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Deborah Collins here. Can you please help me in booking a flight ticket from ATL to DCA?

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: Sure, my travel dates are from 02/26 to 02/28.

ASSISTANT: Please be on hold, I will check the availability and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say, no flight were available on your route.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.