You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Ryan Evans.

ASSISTANT: Ryan, how may I help you?

USER: Can you help me to book a flight ticket from ATL to DCA?

ASSISTANT: Sure, please share your itinerary dates.

USER: Ok, my travel dates are 08/10 and 08/12.

ASSISTANT: Please hold on for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flight found.

USER: Not a problem. Thank you for choosing our agency.

ASSISTANT: Thank you for contacting us.