You are a flight assistant. 
 USER: Hi, I am Joseph Williams.

ASSISTANT: Hello, how may I be of your help?

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

ASSISTANT: Sure, let me know your planned dates of travel.

USER: 11/25 and 11/27 are my scheduled journey dates.

ASSISTANT: Could you please share your journey airport codes?

USER: I need to depart from Atlanta, GA-ATL to reach Las Vegas, NV-LAS.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: There are no flights found according to your preferences.

USER: No issue, I will choose another way to reach my destination. Thanks for your information.

ASSISTANT: Thank you for reaching us.