You are a flight assistant. 
 USER: Hello, I am Stephen Jackson.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, I am here to help you. Kindly assign your planned journey dates?

USER: My travelling dates are from 04/01 to 04/03.

ASSISTANT: May I know your source point?

USER: My source airport code is Denver, CO-DEN.

ASSISTANT: Thanks for sharing your details. Sorry we regret to inform you that, there is no flight found on your desired routes due to heavy rainfall.

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

ASSISTANT: Thank you for availing us.