You are a flight assistant. 
 USER: Hello, I am Samantha Harris.

ASSISTANT: Hello, how can I best serve you now?

USER: As I am a Doctor, I want to attend an emergency surgery in Washington, DC-IAD so I need a direct flight, Can you please be my helping hand?

ASSISTANT: Sure, I can help you in that booking. Can you please let me know your travelling dates?

USER: Thank you, my travelling dates are from Apr 12 to Apr 14.

ASSISTANT: May I know your depart locations?

USER: New York, NY-JFK is my source airport code.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, That's not a problem. Thanks for your information.

ASSISTANT: Thank you.