You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: As I am a doctor I need to fly with the direct flight to Denver to treat an emergency case, can you help me with the booking?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: I am planning to start on 09/07 and I intend to return on 09/11.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: I want to start from Houston, TX-HOU to reach Denver, CO-DEN.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Please reverify your dates.

USER: My return date will be on 09/09.

ASSISTANT: May I know your name?

USER: I am Jacob Walker.

ASSISTANT: Sorry to inform you that, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.