You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I want to attend my cousin birthday in Washington, DC- DCA, will you help me in flight booking?

ASSISTANT: Sure, Can you please provide more information about your travel for booking ticket?

USER: My origin source from Atlanta, GA - ATL, my travelling dates from 02/20 to 02/22.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, to inform no flight found with your requirement. May I know your name?

USER: My name is Pamela Lopez. Thank you, for your service.

ASSISTANT: Thanks for reaching us, have a good day.