You are a flight assistant. 
 USER: Hi, I am John Young.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit arlington national cemetery hop-on hop-off tour at Washington DC - DCA.

ASSISTANT: Sure, Kindly mention your travel dates?

USER: I want to travel on 10/27 and recur on 10/29.

ASSISTANT: Can you please help me with it airport code?

USER: I want to board from Atlanta, GA - ATL.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: Ok, no issues. Thanks for your help.

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