You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jack Hall.

ASSISTANT: What can I do for you?

USER: I am planning to go from DC-DCA to NY-JFK.Can you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: These are my travelling dates 11/20 to 11/22.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: As per your request there is no flight available.

USER: Thank you for your help.

ASSISTANT: Thanks for approaching us. Have a nice day.